Adjusting the image size on the server side has many advantages over processing it in the browser.
This article introduces how to resize images on the server side in PHP.
The code includes two parts:
- imageResizer() is used to process the image
- loadimage() inserts the image url in a simpler format
-
- function imageResizer($url, $width, $height) {
- header('Content-type: image/jpeg');
- list($width_orig, $height_orig) = getimagesize ($url);
- $ratio_orig = $width_orig/$height_orig;
- if ($width/$height > $ratio_orig) {
- $width = $height*$ratio_orig;
- } else {
- $height = $ width/$ratio_orig;
- }
-
- // This resamples the image
- $image_p = imagecreatetruecolor($width, $height);
- $image = imagecreatefromjpeg($url);
- imagecopyresampled($image_p, $image, 0, 0 , 0, 0, $width, $height, $width_orig, $height_orig);
-
- // Output the image
- imagejpeg($image_p, null, 100);
-
- }
-
- //works with both POST and GET
- $method = $_SERVER['REQUEST_METHOD'];
-
- if ($method == 'GET') {
-
- imageResize($_GET['url'], $_GET['w'], $_GET['h' ]);
-
- } elseif ($method == 'POST') {
-
- imageResize($_POST['url'], $_POST['w'], $_POST['h']);
- }
-
- // makes the process simpler
- function loadImage($url, $width, $height){
- echo 'image.php?url=', urlencode($url) ,
- '&w=',$width,
- '&h= ',$height;
- }
-
- ?>
-
- //Above code would be in a file called image.php.
- //Images would be displayed like this:
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