How to resize a picture on the server side of PHP _php tips

This article illustrates how PHP implements resizing pictures on the server side. Share to everyone for your reference. The specific analysis is as follows:

Resizing a picture on the server side can be a lot more beneficial than a browser's processing.
This article describes how to resize a picture on the server side of PHP.

The code consists of two parts:

①imageresizer () is used to process the image
②loadimage () inserts the image URL in a simpler format

<?php 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;
}?>
 

Usage:

Above code would is in a file called image.php.
Images would be displayed as this:  "alt=" "/>

I hope this article will help you with your PHP program design.