How to Resize images on Server Side

I found this amazing small little image resizing code which will resize and display images quickly. All resizing i done on server side.

“The code uses PHP to resize an image (currently only jpeg). Using this method, the resized image is of much better quality than a browser-side resizing. The file size of the new downsized image is also smaller (quicker to download).

The code comes in two parts:

imageResize() is used to process the image
loadImage() inserts the image url in a simpler format”

Code

<?php 
  
   function imageResize($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; 
  
        } 
  
?>

Usage

Above code would be in a file called image.php.

Images would be displayed like this:

`1`	`<img src="<?php loadImage('image.jpg', 50, 50) ?>"` `alt=""` `/>`