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Using PHP to Resize an Image

The sample code given below shows how to resize a jpeg image using a PHP script. Resizing images is useful if, for example, you want to use a single image as both a thumbnail and a larger diagram.

Here is the first file, which we will call "index.php".

<?php
$picture_name = "box.jpg";
?>
<html>
<head></head>
<body>
<?php
print "<img src = display_image.php?picture_name=$picture_name />\n";
?>
</body>
</html>

This web page puts the name "box.jpg" in variable "$picture_name". The web page then inserts an image tag, using the PHP script "display_image.php" as the source for the image.

Here is the PHP script, "display_image.php":

<?php

$picture_name = $_REQUEST['picture_name'];

$max_width = 220;
$max_height = 220;

$size = GetImageSize($picture_name);
$width = $size[0];
$height = $size[1];

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

if ( ($width <= $max_width) && ($height <= $max_height) ) {
$tn_width = $width;
$tn_height = $height;
}
else if (($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;
}

$src = ImageCreateFromJpeg($picture_name);
$dst = ImageCreatetruecolor($tn_width,$tn_height);
ImageCopyResized($dst, $src, 0, 0, 0, 0,
$tn_width,$tn_height,$width,$height);
header('Content-type: image/jpeg');
ImageJpeg($dst, null, -1);
ImageDestroy($src);
ImageDestroy($dst);

?>

This script resizes "box.jpg" to 220x220 pixels.

Note: I found this script somewhere on the web, but I can't remember where. If you are the author of the script, please let the moderator of this site know, and a link will be placed to your site.

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