How to generate picture thumbnails by php

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The details are as follows:

GD2 library is needed here.

Function make_thumb ($src,$dest,$desired_width) {/ * read the source image * / $source_image = imagecreatefromjpeg ($src); $width = imagesx ($source_image); $height = imagesy ($source_image); / * find the "desired height" of this thumbnail, relative to the desired width * / $desired_height = floor ($height* ($desired_width/$width); / * create a new, "virtual" image * / $virtual_image = imagecreatetruecolor ($desired_width,$desired_height) / * copy source image at a resized size * / imagecopyresized ($virtual_image,$source_image,0,0,0,0,$desired_width,$desired_height,$width,$height); / * create the physical thumbnail image to its destination * / imagejpeg ($virtual_image,$dest, 83);} above is all the content of the article "how to generate thumbnails in php". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!