How to adjust the image size on the server side using php

How to adjust the image size on the server side using php

This example describes how to adjust the image size on the server side of php. Share it with you for your reference. The specific analysis is as follows:

Adjusting the image size on the server side is much better than processing the image on the browser.
This article describes how to adjust the image size on the server side of PHP.

The Code consists of two parts:

① ImageResizer () is used to process the image
② Loadimage () inserts the image url in a simpler format

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<? 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:

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

I hope this article will help you with php programming.