PHP _php tutorial on how to resize images on the server side

PHP implementation method for resizing images on the server side

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

The resizing of the image on the server side is a lot more beneficial than the browser processing.
This article describes how PHP adjusts the image size on the server side.

The code consists of two parts:

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

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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:

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Above code would is in a file called image.php. Images would is displayed like this: "Alt=" "/>

I hope this article is helpful to everyone's PHP programming.

http://www.bkjia.com/PHPjc/1017136.html www.bkjia.com true http://www.bkjia.com/PHPjc/1017136.html techarticle PHP Implementation on the server side to adjust the size of the picture The example of this article describes the PHP implementation of the server-side adjustment of the image size method. Share to everyone for your reference. The specific analysis is as follows: ...

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