使用PHP在服务器上压缩jpeg [英] Compress jpeg on server with PHP

问题描述

我有一个约有1500张JPEG图像的站点，我想将它们全部压缩.遍历目录不是问题，但是我似乎找不到用于压缩服务器上已经存在的JPEG的函数(我不想上传新的JPEG)并替换旧的函数.

I have a site with about 1500 JPEG images, and I want to compress them all. Going through the directories is not a problem, but I cannot seem to find a function that compresses a JPEG that is already on the server (I don't want to upload a new one), and replaces the old one.

PHP是否为此提供了内置功能?如果没有，如何从文件夹中读取JPEG到脚本中?

Does PHP have a built in function for this? If not, how do I read the JPEG from the folder into the script?

谢谢.

推荐答案

您没有告诉您是否正在使用GD，所以我认为是这样.

you're not telling if you're using GD, so i assume this.

$img = imagecreatefromjpeg("myimage.jpg");   // load the image-to-be-saved

// 50 is quality; change from 0 (worst quality,smaller file) - 100 (best quality)
imagejpeg($img,"myimage_new.jpg",50);

unlink("myimage.jpg");   // remove the old image

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