[code lang=”php”]
<?php
function imageResize( $ori_file, $new_file )
{
$max_imageSize = 100;
$ori_size = getimagesize($ori_file);
$ori_w = $ori_size[0];
$ori_h = $ori_size[1];

if($ori_w > $ori_h) {
$new_w = $max_imageSize;
$new_h = round(($new_w/$ori_w) * $ori_h);
}
else
{
$new_h = $max_imageSize;
$new_w = round(($new_h/$ori_h) * $ori_w);
}

$ori_img = imagecreatefromjpeg($ori_file);
$new_img = imagecreatetruecolor($new_w, $new_h);
imagecopyresized($new_img, $ori_img, 0, 0, 0, 0, $new_w, $new_h, $ori_w, $ori_h);

imagejpeg($new_img, $new_file);
imagedestroy($ori_img);
imagedestroy($new_img);
}

$imagePath = "./images/";
$ori_file = $imagePath . "test.jpg";
$new_file = $imagePath . "test_resize.jpg";

echo "<H1>Start resizing image</h1>";
imageResize( $ori_file, $new_file );

echo "<H1>Resize complete</h1>";
echo "<img src=’$ori_file’>";
echo "<img src=’$new_file’>";
?>
[/code]