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image_type_to_extension> <gd_info
[edit] Last updated: Fri, 22 Jul 2011

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getimagesize

(PHP 4, PHP 5)

getimagesizeGet the size of an image

Description

array getimagesize ( string $filename [, array &$imageinfo ] )

The getimagesize() function will determine the size of any given image file and return the dimensions along with the file type and a height/width text string to be used inside a normal HTML IMG tag and the correspondant HTTP content type.

getimagesize() can also return some more information in imageinfo parameter.

Note: Note that JPC and JP2 are capable of having components with different bit depths. In this case, the value for "bits" is the highest bit depth encountered. Also, JP2 files may contain multiple JPEG 2000 codestreams. In this case, getimagesize() returns the values for the first codestream it encounters in the root of the file.

Note: The information about icons are retrieved from the icon with the highest bitrate.

Parameters

filename

This parameter specifies the file you wish to retrieve information about. It can reference a local file or (configuration permitting) a remote file using one of the supported streams.

imageinfo

This optional parameter allows you to extract some extended information from the image file. Currently, this will return the different JPG APP markers as an associative array. Some programs use these APP markers to embed text information in images. A very common one is to embed » IPTC information in the APP13 marker. You can use the iptcparse() function to parse the binary APP13 marker into something readable.

Return Values

Returns an array with 7 elements.

Index 0 and 1 contains respectively the width and the height of the image.

Note:

Some formats may contain no image or may contain multiple images. In these cases, getimagesize() might not be able to properly determine the image size. getimagesize() will return zero for width and height in these cases.

Index 2 is one of the IMAGETYPE_XXX constants indicating the type of the image.

Index 3 is a text string with the correct height="yyy" width="xxx" string that can be used directly in an IMG tag.

mime is the correspondant MIME type of the image. This information can be used to deliver images with the correct HTTP Content-type header:

Example #1 getimagesize() and MIME types

<?php
$size 
getimagesize($filename);
$fp fopen($filename"rb");
if (
$size && $fp) {
    
header("Content-type: {$size['mime']}");
    
fpassthru($fp);
    exit;
} else {
    
// error
}
?>

channels will be 3 for RGB pictures and 4 for CMYK pictures.

bits is the number of bits for each color.

For some image types, the presence of channels and bits values can be a bit confusing. As an example, GIF always uses 3 channels per pixel, but the number of bits per pixel cannot be calculated for an animated GIF with a global color table.

On failure, FALSE is returned.

Errors/Exceptions

If accessing the filename image is impossible, or if it isn't a valid picture, getimagesize() will generate an error of level E_WARNING. On read error, getimagesize() will generate an error of level E_NOTICE.

Changelog

Version Description
5.3.0 Added icon support.
5.2.3 Read errors generated by this function downgraded to E_NOTICE from E_WARNING.
4.3.2 Support for JPC, JP2, JPX, JB2, XBM, and WBMP became available.
4.3.2 JPEG 2000 support was added for the imageinfo parameter.
4.3.0 bits and channels are present for other image types, too.
4.3.0 mime was added.
4.3.0 Support for SWC and IFF was added.
4.2.0 Support for TIFF was added.
4.0.6 Support for BMP and PSD was added.
4.0.5 URL support was added.

Examples

Example #2 getimagesize() example

<?php
list($width$height$type$attr) = getimagesize("img/flag.jpg");
echo 
"<img src=\"img/flag.jpg\" $attr alt=\"getimagesize() example\" />";
?>

Example #3 getimagesize (URL)

<?php
$size 
getimagesize("http://www.example.com/gifs/logo.gif");

// if the file name has space in it, encode it properly
$size getimagesize("http://www.example.com/gifs/lo%20go.gif");

?>

Example #4 getimagesize() returning IPTC

<?php
$size 
getimagesize("testimg.jpg"$info);
if (isset(
$info["APP13"])) {
    
$iptc iptcparse($info["APP13"]);
    
var_dump($iptc);
}
?>

Notes

Note:

This function does not require the GD image library.

See Also



image_type_to_extension> <gd_info
[edit] Last updated: Fri, 22 Jul 2011
 
add a note add a note User Contributed Notes getimagesize
utilmind 23-Jul-2011 10:17
Here is the function which determines whether the PNG image contains alpha or not:

<?php
function is_alpha_png($fn){
  return (
ord(@file_get_contents($fn, NULL, NULL, 25, 1)) == 6);
}
?>

The color type of PNG image is stored at byte offset 25. Possible values of that 25'th byte is:
 * 0 - greyscale
 * 2 - RGB
 * 3 - RGB with palette
 * 4 - greyscale + alpha
 * 6 - RGB + alpha
Steve 17-Apr-2011 10:12
The list of defined IMAGETYPE_ constants is on the manual page for exif_imagetype:

http://www.php.net/manual/en/function.exif-imagetype.php
msfs11 at gmail dot com 06-Apr-2011 11:07
One more reason of "Error: getimagesize(): Read error!" may be an zero file size. Check the file size first with function filesize( $file ).
kumarldh at gmail dot com 14-Mar-2011 09:44
I spent quite a time and realised one needs "allow_url_fopen" turned on to be able to use getimagesize(). Hope this help others.
Jesus Zamora 13-Feb-2011 02:20
Returns a array with 4 elements.
The 0 index is the width of the image in pixels.
The 1 index is the height of the image in pixels.
The 2 index is a flag for the image type:

1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(orden de bytes intel), 8 = TIFF(orden de bytes motorola), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM.

The 3 index contains ' height="yyy" width="xxx" '
falkon303 at gmail dot com 10-Feb-2011 06:01
Here's a simple way to resize your images based on a percentage.

<?php

$image_path
= "images/your_image.png";

list(
$width, $height, $type, $attr)= getimagesize($image_path);

//specify what percentage you are resizing to
$percent_resizing = 80;

$new_width = round((($percent_resizing/100)*$width));
$new_height = round((($percent_resizing/100)*$height));

echo
'<img src="'.$image_path.'" height="'.$new_height.'" width="'.$new_width.'">';

?>
Urchin 08-Feb-2011 09:00
On a Debian machine I had a lot of Notices in my log because the system did not understand spaces. While the str_replace and rawurlencode options are ok for remote images, for the local system it is of no use.

I used the following:

getimagesize('"'.$location.'"');

so basically I quoted the location (single_quot-dubble_quote-single_quote).
http [://] gecko [dot] ilch [dot]de 16-May-2010 08:39
I wrote this functions to check, if a picture is bigger than a size, we need to define first ( $setting['thumb_breit'] )
if its bigger, we need to create a thumbnail, if not, just use the original-size
note: create_thumb() is a ownmade funktion by ilch.de

<?php

#  first we check, if gd is loaded and supports all needed imagetypes
function gd_get_info() {
    if (
extension_loaded('gd') and
       
imagetypes() & IMG_PNG and
       
imagetypes() & IMG_GIF and
       
imagetypes() & IMG_JPG and
       
imagetypes() & IMG_WBMP) {
       
        return
true;
    } else {
        return
false;
    }
}

/*
This returns the width of a image
What we need to know is that getimagesize() returns an array

key 0 = image-width
key 1 = image-height
key 3 = both sizes as string
*/
function check_thumb_needed($img) {
   
$bildsizes = getimagesize($img);
   
$bildbreite = $bildsizes[0];
   
        return
$bildbreite;
}

$bildbr = check_thumb_needed($imgdir.$newname);
   
if (
$bildbr !== false && $bildbr > $setting['thumb_breit']) {
       
create_thumb($imgdir.$newname, $thumbdir.'thumb_'.$newname, $setting['thumb_breit']);
} else {
       
create_thumb($imgdir.$newname, $thumbdir.'thumb_'.$newname, $bildbr);
}
modnyj at gmail dot com 26-Apr-2010 11:34
A simple method to resize a image keeping the constraint proportions:

<?php
// Constraints
$max_width = 100;
$max_height = 100;
list(
$width, $height) = getimagesize($img_path);
$ratioh = $max_height/$height;
$ratiow = $max_width/$width;
$ratio = min($ratioh, $ratiow);
// New dimensions
$width = intval($ratio*$width);
$height = intval($ratio*$height);
?>
@hill79 18-Feb-2010 03:57
I needed to find image dimensions for use in some dynamic css, since getimagesize() returns width="x" height="y" at index 3 I had to convert that to a valid CSS format.

Thought I'd share the function in case anyone else needs the same.

<?php
function cssifysize($img) {
$dimensions = getimagesize($img);
$dimensions = str_replace("=\"", ":", $dimensions['3']);
$dimensions = str_replace("\"", "px;", $dimensions);
return
$dimensions;
}

returns width:x;height:y;
?>

I expect there's a way of making that more efficient
Nikki 26-Jan-2010 11:26
This should be easy, but I've re-solved the problem so many times.  Hopefully this is useful:

<?php
// Usage example to find the proper dimensions to resize an image down to 300x400 pixels maximum:
list($width, $height) = getimagesize($image);
$new_dimensions = resize_dimensions(300,400,$width,$height);

// Calculates restricted dimensions with a maximum of $goal_width by $goal_height
function resize_dimensions($goal_width,$goal_height,$width,$height) {
   
$return = array('width' => $width, 'height' => $height);
   
   
// If the ratio > goal ratio and the width > goal width resize down to goal width
   
if ($width/$height > $goal_width/$goal_height && $width > $goal_width) {
       
$return['width'] = $goal_width;
       
$return['height'] = $goal_width/$width * $height;
    }
   
// Otherwise, if the height > goal, resize down to goal height
   
else if ($height > $goal_height) {
       
$return['width'] = $goal_height/$height * $width;
       
$return['height'] = $goal_height;
    }
   
    return
$return;
}
?>
spam at enrogue dot com 15-Jan-2010 02:12
IMAGETYPE_* are not linked to and with a few searches (like "IMAGETYPE_") on the PHP search tool don't give me a reasonable result. So far these are the ones I dug out, based on a comment on another function:
- IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_WBMP

I'm sure there are others...
swapnil dot nkene at gmail dot com 03-Dec-2009 10:08
A simplest method to resize a image keeping the constraint proportions.

<?php
list($width, $height, $type, $attr)=getimagesize($imagepath);
$ht=$height;
$wd=$width;
if(
$width>180){
   
$diff = $width-180;
   
$percnt_reduced = (($diff/$width)*100);
   
$ht = $height-(($percnt_reduced*$height)/100);
   
$wd= $width-$diff;
}
if(
$height>180){
   
$diff = $height-180;
   
$percnt_reduced = (($diff/$height)*100);
   
$wd = $width-(($percnt_reduced*$width)/100);
   
$ht= $height-$diff;
}
?>
geoff at spacevs dot com 21-Oct-2009 06:22
This function returns the width and height of a JPEG image from a string, allowing the dimensions of images stored in a database to be retrieved without writing them to the disk first, or using "imagecreatefromstring" which is very slow in comparison.

<?PHP
function getJPEGImageXY($data) {
       
$soi = unpack('nmagic/nmarker', $data);
        if (
$soi['magic'] != 0xFFD8) return false;
       
$marker = $soi['marker'];
       
$data   = substr($data, 4);
       
$done   = false;

        while(
1) {
                if (
strlen($data) === 0) return false;
                switch(
$marker) {
                        case
0xFFC0:
                               
$info = unpack('nlength/Cprecision/nY/nX', $data);
                                return array(
$info['X'], $info['Y']);
                                break;

                        default:
                               
$info   = unpack('nlength', $data);
                               
$data   = substr($data, $info['length']);
                               
$info   = unpack('nmarker', $data);
                               
$marker = $info['marker'];
                               
$data   = substr($data, 2);
                                break;
                }
        }
}
?>

Doing this 10,000 times takes 0.43 seconds, compared with using imagecreatefromstring/imagesx/imagesy which takes around 1.52 seconds to do the same.

Do not use this instead of getimagesize when dealing with files, getimagesize is much faster coming in at 0.15 seconds.
mycrazydream 24-Jul-2009 04:00
I had for quite some time been using getimagesize() to check for the existence of a remote image. This turned out to take way too long. The following curl solution only checks the http headers so it is much more efficient.

<?php
function checkRemoteFile($url)
{
   
$ch = curl_init();
   
curl_setopt($ch, CURLOPT_URL,$url);
   
// don't download content
   
curl_setopt($ch, CURLOPT_NOBODY, 1);
   
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
   
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    if(
curl_exec($ch)!==FALSE)
    {
        return
true;
    }
    else
    {
        return
false;
    }
}

?>
anonymous 15-Jul-2009 08:37
Well there are a lot of image scaling functions here. Here is my take on it.

<?php
function get_scaled_dim_array($img,$max_w = 100, $max_h = NULL){
    if(
is_null($max_h)){
       
$max_h = $max_w;
    }
    if (
file_exists($img)){
        list(
$img_w,$img_h) = getimagesize($img);
       
$f = min($max_w/$img_w, $max_h/$img_h, 1);
       
$w = round($f * $img_w);
       
$h = round($f * $img_h);
        return array(
$w,$h);
    }
    return
NULL;
}
?>
james dot relyea at zifiniti dot com 08-Feb-2009 04:49
As noted below, getimagesize will download the entire image before it checks for the requested information. This is extremely slow on large images that are accessed remotely. Since the width/height is in the first few bytes of the file, there is no need to download the entire file. I wrote a function to get the size of a JPEG by streaming bytes until the proper data is found to report the width and height:

<?php
// Retrieve JPEG width and height without downloading/reading entire image.
function getjpegsize($img_loc) {
   
$handle = fopen($img_loc, "rb") or die("Invalid file stream.");
   
$new_block = NULL;
    if(!
feof($handle)) {
       
$new_block = fread($handle, 32);
       
$i = 0;
        if(
$new_block[$i]=="\xFF" && $new_block[$i+1]=="\xD8" && $new_block[$i+2]=="\xFF" && $new_block[$i+3]=="\xE0") {
           
$i += 4;
            if(
$new_block[$i+2]=="\x4A" && $new_block[$i+3]=="\x46" && $new_block[$i+4]=="\x49" && $new_block[$i+5]=="\x46" && $new_block[$i+6]=="\x00") {
               
// Read block size and skip ahead to begin cycling through blocks in search of SOF marker
               
$block_size = unpack("H*", $new_block[$i] . $new_block[$i+1]);
               
$block_size = hexdec($block_size[1]);
                while(!
feof($handle)) {
                   
$i += $block_size;
                   
$new_block .= fread($handle, $block_size);
                    if(
$new_block[$i]=="\xFF") {
                       
// New block detected, check for SOF marker
                       
$sof_marker = array("\xC0", "\xC1", "\xC2", "\xC3", "\xC5", "\xC6", "\xC7", "\xC8", "\xC9", "\xCA", "\xCB", "\xCD", "\xCE", "\xCF");
                        if(
in_array($new_block[$i+1], $sof_marker)) {
                           
// SOF marker detected. Width and height information is contained in bytes 4-7 after this byte.
                           
$size_data = $new_block[$i+2] . $new_block[$i+3] . $new_block[$i+4] . $new_block[$i+5] . $new_block[$i+6] . $new_block[$i+7] . $new_block[$i+8];
                           
$unpacked = unpack("H*", $size_data);
                           
$unpacked = $unpacked[1];
                           
$height = hexdec($unpacked[6] . $unpacked[7] . $unpacked[8] . $unpacked[9]);
                           
$width = hexdec($unpacked[10] . $unpacked[11] . $unpacked[12] . $unpacked[13]);
                            return array(
$width, $height);
                        } else {
                           
// Skip block marker and read block size
                           
$i += 2;
                           
$block_size = unpack("H*", $new_block[$i] . $new_block[$i+1]);
                           
$block_size = hexdec($block_size[1]);
                        }
                    } else {
                        return
FALSE;
                    }
                }
            }
        }
    }
    return
FALSE;
}
?>
anonymous 23-Nov-2008 04:30
Note that if you specify a remote file (via a URL) to check the size of, PHP will first download the remote file to your server.

If you're using this function to check the size of user provided image links, this could constitute a security risk.  A malicious user could potentially link to a very large image file and cause PHP to download it.  I do not know what, if any, file size limits are in place for the download.  But suppose the user provided a link to an image that was several gigabytes in size?

It would be nice if there were a way to limit the size of the download performed by this function.  Hopefully there is already a default with some sensible limits.
user at example dot net 23-Jul-2008 04:13
When validating images, allways check both, image type *AND* file extension!

Because most image types allow sections for comments or other irrelevant data. Those section can be used to infiltrate php code onto the server. If these files are stored as sent by the client, files with a ".php" extension can be executed and do tremendous harm.
mike 25-Apr-2008 11:26
Great script shmohel, a bit more minified...

<?php

function scale_image($p,$mw='',$mh='') { // path max_width max_height
   
if(list($w,$h) = @getimagesize($p)) {
    foreach(array(
'w','h') as $v) { $m = "m{$v}";
        if(${
$v} > ${$m} && ${$m}) { $o = ($v == 'w') ? 'h' : 'w';
       
$r = ${$m} / ${$v}; ${$v} = ${$m}; ${$o} = ceil(${$o} * $r); } }
    return(
"<img src='{$p}' alt='image' width='{$w}' height='{$h}' />"); }
}

?>
devon at example dot com 07-Apr-2008 07:14
***********************************
Copies Source Image to Destination Image
***********************************
1. Copies source image
2. Calculates image dimensions
3. Resizes image (you specify max height/width)
4. Retains aspect ratio
5. Writes destination image
***********************************
This was created from a variety of code snippets
I've found here at php.net and other places on the web. 
I take no credit for any of this code other than
putting the pieces together.

<?php

$source_pic
= 'images/source.jpg';
$destination_pic = 'images/destination.jpg';
$max_width = 500;
$max_height = 500;

$src = imagecreatefromjpeg($source_pic);
list(
$width,$height)=getimagesize($source_pic);

$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;

if( (
$width <= $max_width) && ($height <= $max_height) ){
   
$tn_width = $width;
   
$tn_height = $height;
    }elseif ((
$x_ratio * $height) < $max_height){
       
$tn_height = ceil($x_ratio * $height);
       
$tn_width = $max_width;
    }else{
       
$tn_width = ceil($y_ratio * $width);
       
$tn_height = $max_height;
}

$tmp=imagecreatetruecolor($tn_width,$tn_height);
imagecopyresampled($tmp,$src,0,0,0,0,$tn_width, $tn_height,$width,$height);

imagejpeg($tmp,$destination_pic,100);
imagedestroy($src);
imagedestroy($tmp);

?>
info at alex-lawrence dot com 02-Apr-2008 01:17
Could be useful (didn´t know where to post it):

function getImageErrors( $filename, $type = "", $minWidth = 0, $minHeight = 0, $maxWidth = 0, $maxHeight = 0, $maxFileSize = 0 )
{
    $errors = array();
    if ( file_exists( $filename ) )
    {
        $ending = substr( $filename, strpos( $filename, "." ) );
        if ( is_array( $type ) )
        {
            $isTypeOf = false;
            foreach( $type as $eachtype )
            {
                if ( $ending == $eachtype )
                {
                    $isTypeOf = true;
                }
            }
            if ( ! $isTypeOf )
            {
                $errors[ 'type' ] = $ending;
            }
        }
        elseif ( $type != "" )
        {
            if ( $ending != $type )
            {
                $errors[ 'type' ] = $ending;
            }
        }
        $size = getimagesize( $filename );
        if ( $size[ 0 ] < $minWidth )
        {
            $errors[ 'minWidth' ] = $size[ 0 ];
        }
        if ( $size[ 1 ] < $minHeight )
        {
            $errors[ 'minHeight' ] = $size[ 1 ];
        }
        if ( ( $maxWidth > $minWidth ) && ( $size[ 0 ] > $maxWidth ) )
        {
            $errors[ 'maxWidth' ] = $size[ 0 ];
        }
        if ( ( $maxHeight > $minHeight ) && ( $size[ 1 ] > $maxHeight ) )
        {
            $errors[ 'maxHeight' ] = $size[ 1 ];
        }
        if ( ( $maxFileSize > 0 ) && ( filesize( $filename ) > $maxFileSize ) )
        {
            $errors[ 'maxFileSize' ] = filesize( $filename );
        }
    }
    else
    {
        $errors[ 'filename' ] = "not existing";
    }
    return ( count( $errors ) > 0 ? $errors : null );
}
cloned at clonedmadman dot com 25-Feb-2008 10:01
Well, I am making a script which will resize the image when uploaded, however, i am making a multi-uploader, so i came across with a problem: an efficient way of getting a pictures height and width and storing them in an array to resize later. This is what i came up with:

<?php
$links
= array("test1.jpg", "test2.png");
$sizearray = array();
$count = count($links);
for(
$i = 0; $i < $count; $i++) {
   
$size = getimagesize($links[$i]);
    list(
$width, $height) = $size;
   
$sizearray[$links[$i]] = array("width" => $width, "height" => $height);
}
print_r($sizearray);
// which will print out: Array ( [test1.jpg] => Array ( [width] => 300 [height] => 400 ) [test2.png] => Array ( [width] => 680 [height] => 100 ) )
?>
shmohel at gmail dot com 12-Feb-2008 02:27
Rather than making a lengthy function that essentially runs twice (once as width, once as height) I came up with a helpful function that uses variable variables to set a maximum height/width. Hope someone finds this helpful.

function scaleimage($location, $maxw=NULL, $maxh=NULL){
    $img = @getimagesize($location);
    if($img){
        $w = $img[0];
        $h = $img[1];

        $dim = array('w','h');
        foreach($dim AS $val){
            $max = "max{$val}";
            if(${$val} > ${$max} && ${$max}){
                $alt = ($val == 'w') ? 'h' : 'w';
                $ratio = ${$alt} / ${$val};
                ${$val} = ${$max};
                ${$alt} = ${$val} * $ratio;
            }
        }

        return("<img src='{$location}' alt='image' width='{$w}' height='{$h}' />");
    }
}
Anonymous 28-Jan-2008 05:14
// A way to maintain Aspect Ratio
// Here using standard aspect ratio of 4:3 for landscape and 3:4 for portrait.
// example is 50% image resize

//NewWidth = GivenHeight * (OriginalWidth / OriginalHeight)
//NewHeight = GivenWidth * (OriginalHeight / OriginalWidth)
       
$defaultImageWidth = 160; //your gallery image width
$defaultImageHeight = 120; //your gallery image height

$imageWidth = 462; // use getimagesize() to get image width
$imageHeight = 432; // use getimagesize() to get image height
   
if($imageWidth > $imageHeight)
{
    // landscape image
   
    $newWidth = $defaultImageWidth;
    $newHeight = (int)($defaultImageWidth * $imageHeight / $imageWidth);
   
    if($newHeight > $defaultImageHeight)
    {
        $newHeight = $defaultImageHeight;
        $newWidth = (int)($defaultImageHeight * $imageWidth / $imageHeight);
    }

}
elseif ($imageHeight > $imageWidth)
{
    // portrait image
   
    $newHeight = $defaultImageHeight;
    $newWidth = (int)($defaultImageHeight * $imageWidth / $imageHeight);
   
    if($newWidth > $defaultImageWidth)
    {
        $newWidth = $defaultImageWidth;
        $newHeight = (int)($defaultImageWidth * $imageHeight / $imageWidth);
    }
   
}
else
{
    // square image
   
    $newWidth = $defaultImageWidth;
    $newHeight = $defaultImageHeight;
   
}

// here using Image Magick command line utility to resize image, OR you can use some other package.
//@exec("/usr/local/bin/convert $sourceImageFilePath - -resize $newWidthx$newHeight\! $destinationImageFilePath");

echo '<b>New Width:</b>'.$newWidth;
echo "<br>";
echo '<b>New Height:</b>'.$newHeight;
pfarthing at hotmail dot com 10-Jan-2008 11:35
Correction: to find $y2 it should be...

// set y side to a proportional size
$y2 = $m * $x_max; // not $x1

Thanks Norbert =)
info at personalmis dot com 07-Jan-2008 12:42
Seems the various ways people are trying to proportionaly scale an image, up or down, could be more straight forward if one remembers ones algebra.

The formula is, y = mx, where m is the slope of the line. This is the ratio of y:x or m = y/x.

So if...

// max values for x and y
$y_max = 600;
$x_max = 800;

// image size
$y1 = 2000;
$x1 = 3000;

// use width for scaling
if ($x1 > $x_max)
{
    // find slope
    $m = $y1/$x1;
    // set x side to max
    $x2 = $x_max;
    // set y side to a proportional size
    $y2 = $m * $x1;
}

The new image proportionally scaled will be x2 = 800, y2 = 533 (rounded).

To do it from the y side, simply reverse the x's and y's.
redcore at gmail dot com 09-Aug-2007 09:50
It's always good to check out an image's dimensions while attempting to upload to your server or database...especially if it's going to be displayed on a page that doesn't accomodate images beyond a particular size.

<?php

$tmpName
= $_FILES['userfile']['tmp_name'];
       
list(
$width, $height, $type, $attr) = getimagesize($tmpName);

if(
$width>275 || $height>275)
{
die(
"exceeded image dimension limits.");
}

?>
laurens dot stoetzel at gmail dot com 03-Aug-2007 06:18
In reply to John (http://de.php.net/manual/de/function.getimagesize.php#61514):
list will only work with numeric arrays.

<?php
 
//renumber
 
$my_image = array_values(getimagesize('test.jpg'));
 
//use list on new array
 
list($width, $height, $type, $attr) = $my_image;

 
//view new array
 
print_r($my_image);

 
//spit out content
 
echo 'Attribute: '.$attr.'<br />';
  echo
'Width: '.$width.'<br />';
?>
phpnetUNDERSCOREspam at erif dot org 19-Jun-2007 07:26
an alternative to the three options below for finding the width and height of data you know to be an image:

$image = imagecreatefromstring($mydata);
$width = imagesx($image);
$height = imagesy($image);
boshka at gmail dot com 01-Feb-2007 01:40
I was trying to workaround with the problem of getting the mime type of the image from the raw data (the images data is stored in a database and the mime type is not known in advance). Since getimagesize requires a file name, there are some ways to deal with it:
1. call getimagesize with a URL which points to the image - this is too slow.
2. use PHP file i/o wrapper class.
3. use temporary files. The code for #3 could be as follows:

    function getimagesize_raw($data){
        $cwd = getcwd(); #get current working directory
        $tempfile = tempnam("$cwd/tmp", "temp_image_");#create tempfile and return the path/name (make sure you have created tmp directory under $cwd
        $temphandle = fopen($tempfile, "w");#open for writing
        fwrite($temphandle, $data); #write image to tempfile
        fclose($temphandle);
        $imagesize = getimagesize($tempfile); #get image params from the tempfile
        unlink($tempfile); // this removes the tempfile
        return $imagesize;
}
jens at kulmegies dot de 31-Oct-2006 02:30
In addition to thomporter's quick-reference of the output array, here's what PHP 4.4.0 does:

Array[0] = Width
Array[1] = Height
Array[2] = Image Type Flag
Array[3] = width="xxx" height="xxx"
Array[bits] = bits
Array[channels] = channels
Array[mime] = mime-type

There is no chance of getting the mime-type by accessing Array[6]...
egingell at sisna dot com 06-May-2006 10:14
<?

// These constants are used by image_info(), below.
define ('IMAGE_WIDTH', 'width');
define ('IMAGE_HEIGHT', 'height');
define ('IMAGE_TYPE', 'type');
define ('IMAGE_ATTR', 'attr');
define ('IMAGE_BITS', 'bits');
define ('IMAGE_CHANNELS', 'channels');
define ('IMAGE_MIME', 'mime');

/**
 * mixed image_info( file $file [, string $out] )
 *
 * Returns information about $file.
 *
 * If the second argument is supplied, a string representing that information will be returned.
 *
 * Valid values for the second argument are IMAGE_WIDTH, 'width', IMAGE_HEIGHT, 'height', IMAGE_TYPE, 'type',
 * IMAGE_ATTR, 'attr', IMAGE_BITS, 'bits', IMAGE_CHANNELS, 'channels', IMAGE_MIME, and 'mime'.
 *
 * If only the first argument is supplied an array containing all the information is returned,
 * which will look like the following:
 *
 *    [width] => int (width),
 *    [height] => int (height),
 *    [type] => string (type),
 *    [attr] => string (attributes formatted for IMG tags),
 *    [bits] => int (bits),
 *    [channels] => int (channels),
 *    [mime] => string (mime-type)
 *
 * Returns false if $file is not a file, no arguments are supplied, $file is not an image, or otherwise fails.
 *
 **/
function image_info($file = null, $out = null) {

   
// If $file is not supplied or is not a file, warn the user and return false.
   
if (is_null($file) || !is_file($file)) {
        echo
'<p><b>Warning:</b> image_info() => first argument must be a file.</p>';
        return
false;
    }

   
// Defines the keys we want instead of 0, 1, 2, 3, 'bits', 'channels', and 'mime'.
   
$redefine_keys = array(
       
'width',
       
'height',
       
'type',
       
'attr',
       
'bits',
       
'channels',
       
'mime',
    );

   
// If $out is supplied, but is not a valid key, nullify it.
   
if (!is_null($out) && !in_array($out, $redefine_keys)) $out = null;

   
// Assign usefull values for the third index.
   
$types = array(
       
1 => 'GIF',
       
2 => 'JPG',
       
3 => 'PNG',
       
4 => 'SWF',
       
5 => 'PSD',
       
6 => 'BMP',
       
7 => 'TIFF(intel byte order)',
       
8 => 'TIFF(motorola byte order)',
       
9 => 'JPC',
       
10 => 'JP2',
       
11 => 'JPX',
       
12 => 'JB2',
       
13 => 'SWC',
       
14 => 'IFF',
       
15 => 'WBMP',
       
16 => 'XBM'
   
);
   
$temp = array();
   
$data = array();

   
// Get the image info using getimagesize().
    // If $temp fails to populate, warn the user and return false.
   
if (!$temp = getimagesize($file)) {
        echo
'<p><b>Warning:</b> image_info() => first argument must be an image.</p>';
        return
false;
    }

   
// Get the values returned by getimagesize()
   
$temp = array_values($temp);

   
// Make an array using values from $redefine_keys as keys and values from $temp as values.
   
foreach ($temp AS $k => $v) {
       
$data[$redefine_keys[$k]] = $v;
    }

   
// Make 'type' usefull.
   
$data['type'] = $types[$data['type']];

   
// Return the desired information.
   
return !is_null($out) ? $data[$out] : $data;   
}

?>
Russell Chappell 31-Mar-2006 03:01
For those of you who are confused about what the mime type IE displays image/pjpeg and other browsers image/jpeg and are building in checks for all of your scripts to tell the difference i would suggest using the getimagesize() mime results which will always be image/jpeg regardless what browser you use.

<?php
$info
= getimagesize("image.jpg");
foreach(
$info as $key => $value) {
    echo
$key . ' - ' . $value . '<br />';
}
?>

Where it says mime always is image/jpeg
John 06-Feb-2006 07:57
I was coming here to see if there was a simple way to get the height, width, and mime type of an image I have uploaded and while I thought the following code would work because it is printed above
<?php
list($width, $height, $type, $attr) = getimagesize("img/flag.jpg");
?>

it didnt when I tried to echo out $type; so heres my fix, there may be a better way but it works for me!

<?php
$blah
= getimagesize("folder/file.gif");
$type = $blah['mime'];
$width = $blah[0];
$height = $blah[1];
?>

and then you can just echo out one of the variables about to get whichever you would desire.
gormozus at yahoo dot com 15-Nov-2005 06:56
getimagesize() seems to cache the results, so if you resize an image (using the methods described earlier) and you want to re-read its width and height, use imagesx() and imagesy() to get the actual information.
webmaster at WWW.ELLESSEWEB.NET 26-Oct-2005 12:10
This is a useful function to display a thumbnail of a whatever image.
This piece of code has been lightly modified from an example found on <b>NYPHP.ORG</B>.
This function can build a thumbnail of any size you want and display it on your browser!
Hope it can be useful for you guys!

<?php

function makeThumbnail($o_file, $t_ht = 100) {
   
$image_info = getImageSize($o_file) ; // see EXIF for faster way
   
   
switch ($image_info['mime']) {
        case
'image/gif':
            if (
imagetypes() & IMG_GIF)  { // not the same as IMAGETYPE
               
$o_im = imageCreateFromGIF($o_file) ;
            } else {
               
$ermsg = 'GIF images are not supported<br />';
            }
            break;
        case
'image/jpeg':
            if (
imagetypes() & IMG_JPG)  {
               
$o_im = imageCreateFromJPEG($o_file) ;
            } else {
               
$ermsg = 'JPEG images are not supported<br />';
            }
            break;
        case
'image/png':
            if (
imagetypes() & IMG_PNG)  {
               
$o_im = imageCreateFromPNG($o_file) ;
            } else {
               
$ermsg = 'PNG images are not supported<br />';
            }
            break;
        case
'image/wbmp':
            if (
imagetypes() & IMG_WBMP)  {
               
$o_im = imageCreateFromWBMP($o_file) ;
            } else {
               
$ermsg = 'WBMP images are not supported<br />';
            }
            break;
        default:
           
$ermsg = $image_info['mime'].' images are not supported<br />';
            break;
    }
   
    if (!isset(
$ermsg)) {
       
$o_wd = imagesx($o_im) ;
       
$o_ht = imagesy($o_im) ;
       
// thumbnail width = target * original width / original height
       
$t_wd = round($o_wd * $t_ht / $o_ht) ;

       
$t_im = imageCreateTrueColor($t_wd,$t_ht);
       
       
imageCopyResampled($t_im, $o_im, 0, 0, 0, 0, $t_wd, $t_ht, $o_wd, $o_ht);
       
       
imageJPEG($t_im);
       
       
imageDestroy($o_im);
       
imageDestroy($t_im);
    }
    return isset(
$ermsg)?$ermsg:NULL;
}
?>

Here the code to call the function:

<?

header
("Content-type: image/jpeg");
makeThumbnail("http://it2.php.net/images/php.gif", 300);

?>
Mark at Mild Peril 13-Oct-2005 11:54
To solve the problem with using absolute site filepaths, as experienced by Brian:

$size = getimagesize($_SERVER["DOCUMENT_ROOT"].$file);

(where $file is something like "/rootdir/graphics/photo.jpg")
paul at goldenbakery dot nl 05-Aug-2005 09:02
Note that the canvas of a Flash movie can not be empty for getimagesize() to read the dimensions of an SWF. Not sure if this is a bug, a feature or just a limitation of the SWF format.

Flash version does not seem to matter. Also tested with Flash 8 beta.
Sean 30-May-2005 05:23
I needed a quick way to make a group of images uniformly sized, but only on one page.  So creating a new set of thumbnails was overdoing the whole thing.  I made up this script that seems to do the trick.

<?php
     $image
"absolute/path/to/image/image.jpg";               
    
$size = getimagesize("$image");
      
$height = $size[1];
      
$width = $size[0];
     if (
$height > 150)
          {
              
$height = 150;
              
$percent = ($size[1] / $height);
              
$width = ($size[0] / $percent);
          }
     else if (
$width > 150)
          {
              
$width = 150;
              
$percent = ($size[0] / $width);
              
$height = ($size[1] / $percent);
          }
     echo
"<img src\"image/path/image.jpg\" height=\"$height\" width=\"$width\" />";
?>
irregular at inbox dot ru 30-Apr-2005 11:24
I've wrote this piece of useful code.
May be it will be useful for you.
But i got a problem - if source image is in the area with need of authorization then the functions that read some files from that place (i.e. getimagesize, imagejpeg) does not work!
How to solve it?

<?php
//i't a stand-alone file named resize.php
//the feature is caching
// /image/thumbcache folder is used with file name forming by md5($img.$calc_width.$calc_height);
//it gets such parameters:
//img - image address (URL)
//w - optional width
//h - optional height
//if you set either w or h, then the image is resized proportionaly, according to the source
//if you set neither w nor h then the script just output file
//if you set both w or h then the image will be resized exactly how you want

   
$server_root = 'http://'.$_SERVER['SERVER_NAME'].'/';

    if (isset(
$_GET['img']) && ((isset($_GET['w']) || isset($_GET['h'])))
    {
       
$img = substr($_GET['img'],0,100);
        if (isset(
$_GET['w'])) $w = substr($_GET['w'],0,10);
        if (isset(
$_GET['h'])) $h = substr($_GET['h'],0,10);

       
error_reporting(0);

       
//check cache
       
$hash = md5($img.$w.$h);
       
$pos = strrpos($img,".");
       
$ext = substr($img,$pos+1,strlen($img)-$pos);
       
$fname = $hash.'.'.$ext;
       
$cachedim = @imagecreatefromjpeg($serverroot.'images/thumbcache/'.$fname);
        if (
$cachedim) //just show cached thumbnail
       
{
           
header("Content-type: image/jpeg");
           
imagejpeg($cachedim,'',100);
        }
        else
//create and cache thumbnail and show it 'cause it's not in cache
       
{
            list(
$width, $height, $type, $attr) = getimagesize($img);
            if (
$type==2) //jpeg
           
{
               
$im = @imagecreatefromjpeg($img); /* Attempt to open */
               
if (!$im) { /* See if it failed */
           
$im  = imagecreate(150, 30); /* Create a blank image */
                   
$bgc = imagecolorallocate($im, 255, 255, 255);
                   
$tc  = imagecolorallocate($im, 0, 0, 0);
                   
imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
                   
imagestring($im, 1, 5, 5, "Error loading image!", $tc);
                }
                else
                {
                   
//constrain proportions if needed
                   
if (isset($w)){ if ($w==0) $w = $width; }
                    else
$w = $width*$h/$height;

                    if (isset(
$h)){ if ($h==0) $h = $height; }
                    else
$h = $height*$w/$width;

                   
$dstw=isset($w)?$w:$width;
                   
$dsth=isset($h)?$h:$height;
                   
$tim = imagecreatetruecolor($dstw,$dsth);
           
           
imagecopyresampled($tim,$im,0,0,0,0,$dstw,$dsth,$width,$height);
                   
                   
header("Content-type: image/jpeg");
                   
imagejpeg($tim,'./images/thumbcache/'.$fname,100);
                   
imagejpeg($tim,'',100);
                }
            }
        }
       
error_reporting(E_ALL);
    }

?>
ajreading at classixshop dot com 21-Apr-2005 08:30
A simple piece of code i wrote to proportionally resize an image to a max height and width then display it

<?php
// Max height and width
$max_width = 100;
$max_height = 100;

// Path to your jpeg

$upfile '/path/to/file.jpg';
   
Header("Content-type: image/jpeg");
   
   
$size = GetImageSize($upfile); // Read the size
         
$width = $size[0];
         
$height = $size[1];
         
         
// Proportionally resize the image to the
          // max sizes specified above
         
         
$x_ratio = $max_width / $width;
         
$y_ratio = $max_height / $height;

          if( (
$width <= $max_width) && ($height <= $max_height) )
          {
              
$tn_width = $width;
              
$tn_height = $height;
          }
          elseif ((
$x_ratio * $height) < $max_height)
          {
              
$tn_height = ceil($x_ratio * $height);
              
$tn_width = $max_width;
          }
          else
          {
              
$tn_width = ceil($y_ratio * $width);
              
$tn_height = $max_height;
          }
    
// Increase memory limit to support larger files
    
    
ini_set('memory_limit', '32M');
    
    
// Create the new image!
    
$src = ImageCreateFromJpeg($upfile);
    
$dst = ImageCreateTrueColor($tn_width, $tn_height);
    
ImageCopyResized($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);
    
ImageJpeg($dst);
// Destroy the images
ImageDestroy($src);
ImageDestroy($dst);
?>
mail at soylentgreens dot com 31-Mar-2005 02:37
How about this for cropping images...

<?php

$imgfile
= "img.jpg";
$cropStartX = 300;
$cropStartY = 250;
$cropW   = 200;
$cropH   = 200;

// Create two images
$origimg = imagecreatefromjpeg($imgfile);
$cropimg = imagecreatetruecolor($cropW,$cropH);

// Get the original size
list($width, $height) = getimagesize($imgfile);

// Crop
imagecopyresized($cropimg, $origimg, 0, 0, $cropStartX, $cropStartY, $width, $height, $width, $height);

// TODO: write code to save new image
// or, just display it like this:
header("Content-type: image/jpeg");
imagejpeg($cropimg);

// destroy the images
imagedestroy($cropimg);
imagedestroy($origimg);

?>
Coodiss at w3bbix dot net 16-Mar-2005 05:51
Heres a easy way to scale images to the <td> that they are in
*this is broken up so anyone can understand it :)

<?
$imageinfo
= getimagesize("images/picture.jpg");
         
$ix=$imageinfo[0];
$iy=$imageinfo[1];

$widthscale = $ix/175//<TD> WIDTH
$heightscale = $iy/175; //<TD> HEIGHT

if($widthscale < 1)
$nwidth = $ix*$widthscale;
else
$nwidth = $ix/$widthscale;

if(
$heightscale < 1)
$nheight = $iy*$heightscale;
else
$nheight = $iy/$heightscale;

?>
php dot net at dannysauer dot com 12-Feb-2005 04:23
Note that, if you're going to be a good programmer and use named constatnts (IMAGETYPE_JPEG) rather than their values (2), you want to use the IMAGETYPE variants - IMAGETYPE_JPEG, IMAGETYPE GIF, IMAGETYPE_PNG, etc.  For some reason, somebody made a horrible decision, and IMG_PNG is actually 4 in my version of PHP, while IMAGETYPE_PNG is 3.  It took me a while to figure out why comparing the type against IMG_PNG was failing...
sixzero4 at hotmail dot com 30-Nov-2004 04:33
This is just to add to the comment by robertks at hotmail dot com on
05-Mar-2003 12:12 regarding trying to derive the dimensions of a video file. The package referenced (http://www.getid3.org/) had been updated, and below is a script I use to get the size. You can get many other attributes of media files as well.

<?php
// include getID3() library (can be in a different directory if full path is specified)
 
include_once('getid3.php');
 
// Initialize getID3 engine
$getID3 = new getID3;

 
// File to get info from
 
$file_location = './your/path/to/file.mov';

// Get information from the file
 
$fileinfo = $getID3->analyze($file_location);
 
getid3_lib::CopyTagsToComments($fileinfo);
 
 
// Output results
if (!empty($fileinfo['video']['resolution_x'])) { echo '<p> video width: '.$fileinfo['video']['resolution_x'].'</p>'; }
if (!empty(
$fileinfo['video']['resolution_y'])) { echo '<p> video height: '.$fileinfo['video']['resolution_y'].'</p>'; }
?>

Hope that helps others looking for a function similar to getimagesize() for a video or media file.
Joshua 16-Aug-2004 07:26
If your image name has spaces in it you will need to use rawurlencode() and NOT urlencode() as this function (at least in 4.3.4) does not accept spaces as + signs.
cstdenis at hotmail dot com 11-Aug-2004 06:42
This will not work for swf files unless zlib is compiled into php statically (not as a shared module). Bug #29611

As of PHP 5.0.0 it will just return false, but that should change to a notice by the next release.
ryan at vitalmodels dot com 05-Jun-2004 08:06
--- Editor's Note:
It's easier to call on urlencode() or rawurlencode() to "fix" urls containing spaces and other characters that normally not well-liked.
---

You may have noticed that images with spaces WONT work with getimagesize - some of us have massive amounts of pictures, or don't feel like rewriting file names on users uploaded pictures- so here is a super fast fix that will replace the spaces once the image is called and will work with getimagesize flawlessly-

$image_new = "/pictures/$pic[picture]";  //PICTURE URL
$image_new = str_replace(' ','%20',$image_new); //REPLACE THE SPACES

Now you just call $image_new using getimagesize and you wont' have anymore problems.

On my site I take uploaded pictures from users - then resize them if they are over a certain width, here is the script i use if anyone would like to do this-

$image_new = "/pictures/$pic[picture]"; //url of picture
$image_new = str_replace(' ','%20',$image_new); //take url and replace spaces
$max_width= "480";  //maximum width allowed for pictures
$resize_width= "480";  //same as max width
$size = getimagesize("$image_new");    //get the actual size of the picture
$width= $size[0];           // get width of picture
$height= $size[1];   // get height of picture
if ($width>$max_width){
            $new_width=$resize_width;  // Resize Image If over max width
}else {
            $new_width=$width;       // Keep original size from array because smaller than max

}

echo "<IMG src=\"$image_new\" border=1  width=$new_width>"   //print image with new width

Hope this helps anyone who wants some simple uses for getimagesize- check out my website to see it in action- vitalmodels.com
diablx at hotmail dot com 25-May-2004 09:36
I'm sorry for they other scripts, but I made one mistake about the image resizing... here is a working script !
<?
   
// Some configuration variables !
   
$maxWidth = 90;
   
$maxHeight = 90;
   
$maxCols = 8;
   
$webDir = "https://localhost/images/";
   
$localDir = $_SERVER['DOCUMENT_ROOT']."/images/";

   
$AutorisedImageType = array ("jpg", "jpeg", "gif", "png");
?>

<center>
<table border='1' cellspacing='5' cellpadding='5' style="border-collapse:collapse; border-style: dotted">
<tr>
   <?
  
// Open localDir
  
$dh = opendir($localDir);
   while (
false !== ($filename = readdir($dh))) {
      
$filesArray[] = $filename;
   }

  
// Display and resize
  
foreach ($filesArray as $images) {
  
      
$ext = substr($images, strpos($images, ".")+1, strlen($images));
      
       if(
in_array($ext, $AutorisedImageType) ) {

           list(
$width, $height, $type, $attr) = @getimagesize( $localDir.$images );

           
$xRatio = $maxWidth / $width;
           
$yRatio = $maxHeight / $height;
           
            if ( (
$width <= $maxWidth) && ($height <= $maxHeight) ) {
             
$newWidth = $width;
             
$newHeight = $height;
            }
            else if ((
$xRatio * $height) < $maxHeight) {
             
$newHeight = ceil($xRatio * $height);
             
$newWidth = $maxWidth;
            }
            else {
             
$newWidth = ceil($yRatio * $width);
             
$newHeight = $maxHeight;
            }
          
           if(
$i == $maxCols) {
               echo
"</tr><tr>";
              
$i = 0;
           }
           echo
"<td align='center' valign='middle' width='$maxWidth' height='$maxHeight'><img src='".$webDir.$images."' width='$newWidth' height='$newHeight'></td>";
          
$i++;
       }
   }
?>
</tr>
</table>
</center>
MagicalTux at FF.st 31-Mar-2004 11:35
simm posted something interesting about imagick, but usually calling an external binary is not the best way.

You can use the Imagick PHP module . With it, you do not even need to get the image size to generate thubnails...

Here's the code I used :
<?php
    $imh
=imagick_readimage($image);
   
imagick_scale($imh,GALLERY_THUMBNAILWIDTH,GALLERY_THUMBNAILHEIGHT);
   
imagick_writeimage($imh,$image_thumb);
?>

(I noticed that some hosting companies are now providing the imagick module by default. Using it allows you to accept any type of image from your visitors. Maybe it will be documented on the official PHP website one day or another? )
MarioPro 11-Mar-2004 02:13
The Problem:
I've just noticed that after upgrading to the PHP 4.3.4 version, the old GetImageSize() should get your attention on pages coded before this new version.

The solutions:
So, if you used GetImageSize(), you should now be using getimagesize() - attention to all lower caracters.

Also, you shou certify that the image realy exists, otherwhise you'll get the following error: getimagesize(): Read error!
This means that there is no image to "fill" the string and thus you're calling, for example: "images/news/" instead of calling "images/news/03102004a.jpg"

One should now verify if there is an image to be called (example):
if($photo1!=""){
$size1=getimagesize("images/news/".$photo_news_1"]);
$width1=$size1[0];
$height1=$size[1];
}
Here, if $photo_news_1 is set and exists it will be displayed, otherwhise it will be skiped and no ERROR message will be displayed. In the PHP 4.3.3 and earlier versions, this was not necessary but it is now!  ;)
yohami dot com - zerodj at hotmail dot com 14-Jan-2004 03:11
A cool resize / cropping script for creating thumbnails using mogrify

IMAGETEST.PHP

<?php

include 'mogrify.php';

// variables from flash (my website uses flash and php)
$picture="sample.jpg";
$fixedwidth=300;
$fixedheight=240;
//

cropimage($picture,$fixedwidth,$fixedheight,$mogrify);

 
?>

MOGRIFY.PHP

<?php
// walking the path
$mogrify="C:/apache/Imagik/mogrify.exe";

// ---------------------------------------- crop function

function cropimage($picture,$fixedwidth,$fixedheight,$mogrify) {

   
// GET IMG
   
$img = imagecreatefromjpeg($picture);
   
$width= imagesx($img);
   
$height= imagesy($img);
   
// CROP WIDTH
   
if($width!=$fixedwidth){
       
$ratio =$fixedwidth/$width;
       
$NewHeight=round($height*$ratio);
       
$NewWidth=round($width*$ratio);
       
exec( $mogrify." -resize ".$NewWidth."x".$NewHeight."! $picture");
       
exec( $mogrify." -crop ".$fixedwidth."x".$fixedheight."+0+0 $picture");
       
// REFRESH
       
$img = imagecreatefromjpeg($picture);
       
$width= imagesx($img);
       
$height= imagesy($img);
    }
   
// CROP HEIGHT
   
if($height!=$fixedheight){
       
$ratio =$fixedheight/$height;
       
$NewHeight=round($height*$ratio);
       
$NewWidth=round($width*$ratio);
       
exec( $mogrify." -resize ".$NewWidth."x".$NewHeight."! $picture");
       
exec( $mogrify." -crop ".$fixedwidth."x".$fixedheight."+0+0 $picture");
    }
   
//
   
ImageDestroy($img);
}

?>

yeah!
php (at) thejpster org uk 02-Dec-2003 02:39
If you want to resize an image proportionally to fit within a given area, like I did, the following code might help you out.

If either hscale or wscale are greater than 1 then that dimension is too big. If you then scale your image by the larger of the two values (hscale, wscale) then you guarantee that both dimensions will now fit in your specified area :)

function makeImg($num) {
    global $hmax, $wmax; // max width and height
    $image = "somefile.jpg";
    list($width, $height, $type, $attr) = getimagesize($image);
    $hscale = $height / $hmax;
    $wscale = $width / $wmax;
    if (($hscale > 1) || ($wscale > 1)) {
        $scale = ($hscale > $wscale)?$hscale:$wscale;
    } else {
        $scale = 1;
    }
    $newwidth = floor($width / $scale);
    $newheight= floor($height / $scale);

    return "<img width='$newwidth' height='$newheight' src='$image'><br>$image: $newwidth x $newheight : $width x $height";
}
djwishbone at hotmail dot com 19-Nov-2003 02:31
Using remote files with getimagesize($URL) never worked for me.  Except when I would grab files from the same server.  However, I developed some code with the help from the people here that does work.  If you are having problems give this function a shot:

function getimagesize_remote($image_url) {
    $handle = fopen ($image_url, "rb");
    $contents = "";
    if ($handle) {
    do {
        $count += 1;
        $data = fread($handle, 8192);
        if (strlen($data) == 0) {
            break;
       }
    $contents .= $data;
    } while(true);
    } else { return false; }
    fclose ($handle);

    $im = ImageCreateFromString($contents);
    if (!$im) { return false; }
    $gis[0] = ImageSX($im);
    $gis[1] = ImageSY($im);
// array member 3 is used below to keep with current getimagesize standards
    $gis[3] = "width={$gis[0]} height={$gis[1]}";
    ImageDestroy($im);
    return $gis;
}

goodluck
janoma_cl 09-Oct-2003 10:19
If you want to show thumbnails keeping the original proportions, with defined maximum width and height, you can use this function. This is useful when showing tables of user-uploaded images, that not necessarily are same-sized. However, for big images (like wallpapers), a better option is to create separated thumbnails with a image-editing software.

If the image is smaller or equal than the defined maximums, then it's showed without resizing. If not, creates a link to a pop-up that shows the full-size image.

<?php
function show_thumbnail($file)
{
   
$max = 200 // Max. thumbnail width and height

   
$size = getimagesize($file);

    if (
$size[0] <= $max && $size[1] <= $max )
    {
       
$ret = '<img src="'.$file.'" '.$size[3].' border="0">';
    }
    else
    {
       
$k = ( $size[0] >= $size[1] ) ? $size[0] / $max : $size[1] / $max;
       
$ret = '<a href="javascript:;" onClick="window.open(\'image.php?img=';
       
$ret .= $file.'\',\'\',\'width='.$size[0];
       
$ret .= ',height='.$size[1].'\')">';
       
$ret .= '<img src="'.$file.'" width="'.floor($size[0]/$k).'" height="'.floor($size[1]/$k).'" border="0" alt="View full-size image"></a>';
    }

    return
$ret;
}
?>

Here is the code of 'image.php':

<html>
<head>
<title>Image</title>
</head>
<body leftmargin="0" topmargin="0">
<?php echo ( is_file($_GET['img']) ) ? '<a href="#" onClick="window.close();"><img src="'.$_GET['img'].'" border="0" alt="Close window"></a>' : 'Invalid image filename, or no filename entered. <a href="#" onClick="window.close();">Close window</a>.' ?>
</body>
</html>
simms 03-Sep-2003 04:47
here's a nice way of resizing user-uploaded files on the fly, using ImageMagick (on linux), but no GD:

<?

if( $image_info = getimagesize( "/upload_dir/" . $uploadName ) )
{
  if(
$image_info[ 0 ] > $defaultImgWidth )
  {
   
exec( "mogrify -geometry " . $defaultImgWidth . " " . "/upload_dir/" . $uploadName . " &" );
  }
}

?>

$defaultImgWidth would be the target width of the image -- note that the code above resizes the image without distorting its original proportions, and only if it is wider than $defaultImgWidth.
the ImageMagick syntax used above ("mogrify ..") overwrites the original file ($uploadName) with the resized image.
ten tod xmg ta rotanimrev (reverse it) 01-Sep-2003 05:30
An additional note to "tightcode_nosp@m_hotmail":

If that doesn't work try this instead:

<?
      $img
= imagecreatefromjpeg ($filename);
     
$x = imagesx ($img);
     
$y = imagesy ($img);
     
imagedestroy ($img);
?>

Though keep in mind that this consumes lots of CPU. So if you're doing something like creating a page of thumbnails this is considerably slower.

So what you can do is use getimagesize() and check if
- the width and height are empty strings ("")
- and those two values aren't too high

Both indicate that getimagesize() didn't work properly. The latter may happen if getimagesize() thought that it recognized the format and therefore the size properly. I mean if you're looking at pictures that you know are max. 1024x768 and getimagesize() returns a width of e.g. 20234 then it's obvious that something went wrong. In that case use the code mentioned above. Of course if getimagesize() returned small values that are wrong you still get the wrong size. So check your pictures and priorities first.

So all of this could look like as follows:

<?
    $picinfo
= @getimagesize ($filename);
    if (
$picinfo !== false) {
     
$x = $picinfo [0];
     
$y = $picinfo [1];
    }

   
// change this according the picture resolutions you're expecting
   
if ($x > 2000 || $y > 2000) $x = $y = "";

    if (
$x == "") {
     
$img = imagecreatefromjpeg ($filename);
     
$x = imagesx ($img);
     
$y = imagesy ($img);
     
imagedestroy ($img);
    }
?>

Note: fix syntax stuff if there's an error as I compiled this example from a few places.

If you don't care about the huge load on your CPU or you have to rely on the proper size use the snippet noted at the beginning only.
justin at webtekconcepts dot com 15-Aug-2003 08:27
For those that like to go the dynamic thumbnail route, I've found that you can get warnings with getimagesize() after your loop through more than 3 to 4 images. In my case I needed 12 images on each page.

Use usleep() in your loop just before you run getimagesize() otherwise you'll end up with warnings, big images and a broken page. Using usleep() lets the server recoup for X milliseconds so it will accept connections again for the image size.

I've found that usleep(1500) is the best for my situation. This barely slows the page down and allows for getimagesize() to work 100% of the time for me.
webmaster AT theparadox DOT org 31-May-2003 12:16
I figured others have wanted to scale an image to a particular height or width while preserving the height/width ratio. So here are the functions I wrote to accomplish this. Hopefully they'll save somebody else the five minutes it took to write these.

You give the filename and the dimension you want to use, and these functions return the opposite dimension:

function scale_to_height ($filename, $targetheight) {
   $size = getimagesize($filename);
   $targetwidth = $targetheight * ($size[0] / $size[1]);
   return $targetwidth;
}
         
function scale_to_width ($filename, $targetwidth) {
   $size = getimagesize($filename);
   $targetheight = $targetwidth * ($size[1] / $size[0]);
   return $targetheight;
}
robertks at hotmail dot com 05-Mar-2003 05:12
For those of you trying to derive the dimensions of a video file (e.g. Video for Windows AVI, Quicktime MOV, MPEG MPG, Windows Media Video WMV or ASF, etc.), you will find the getid3 library to be indispensible.  Found at http://getid3.sourceforge.net, here's an example of its use in a script:

include_once('getid3.php'); // or wherever you actually put the getid3 scripts
$file_location = './myvideo.avi';
$file_info = GetAllFileInfo($file_location) // calls getid3 function
$file_width = $file_info['video']['resolution_x'];
$file_height = $file_info['video']['resolution_y'];

You can then use your OBJECT and EMBED tags in HTML to put the video into a web page, and make the PHP template independent of the size parameters of the particular video it happens to be loading.  (Just remember to add pixels to the video height to accomodate the controller of the embedded player: typically, 16 pixels for Quicktime, 46 pixels for Windows Media Player 6, and 64 pixels for Windows Media Player 7.
mogster at boomdesign dot no 09-Mar-2002 06:58
Really useful info from webmasterb@feartheclown.com and you others :-)
Saved my butt...
Here's a build on that, with proportional resizing of the image-upload ($newpic) to a fixed value ($maxwidth):
$maxwidth = "350";
$imagehw = GetImageSize($newpic);
$imagewidth = $imagehw[0];
$imageheight = $imagehw[1];
$imgorig = $imagewidth;
if ($imagewidth > $maxwidth {
  $imageprop=($maxwidth*100)/$imagewidth;
  $imagevsize= ($imageheight*$imageprop)/100 ;
  $imagewidth=$maxwidth;
  $imageheight=ceil($imagevsize);
}
Of course this does not resize the image itself, but returns values one may use in html-code to restrain users from killing your design...

knutm

 
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