-to resize an image to a height of 400px (width will be kept to the right aspect ratio)
-to resize an image to a width of 400px (height will be kept to the right aspect ratio)
This script is very simple and should not be considered for production use. There are many image
resizing scripts available that have better error checking, support for other formats (this only
supports jpg) and have image caching. Cachine makes a HUGE difference to overall speed.
@author Harvey Kane harvey@harveykane.com
*/
/* Get information from Query String */
if (!isset($_GET['file']) || !isset($_GET['size'])) {
echo "Image variables not specified correctly";
exit();
}
$file = $_GET['file'];
$size = $_GET['size'];
/* Get image dimensions and ratio */
list($width, $height) = getimagesize($file);
$ratio = $width / $height;
/* Decide how we should resize image - fixed width or fixed height */
if (substr($size, 0, 1) == 'h') {
$type = 'fixedheight';
} elseif (substr($size, 0, 1) == 'w') {
$type = 'fixedwidth';
} elseif ($height > $width) {
$type = 'fixedheight';
} else {
$type = 'fixedwidth';
}
/* Calculate new dimensions */
if ($type == 'fixedheight') {
$new_width = floor(str_replace('h','',$size) * $ratio);
$new_height = str_replace('h','',$size);
} else {
$new_width = str_replace('w','',$size);
$new_height = floor(str_replace('w','',$size) / $ratio);
}
/* Resample */
$new_image = imagecreatetruecolor($new_width, $new_height);
$old_image = imagecreatefromjpeg($file);
imagecopyresampled($new_image, $old_image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
/* Output */
header('Content-type: image/jpeg');
imagejpeg($new_image, null, 100);
exit();