RegEx-如何在文件扩展名之前插入字符串 [英] RegEx - How To Insert String Before File Extension

问题描述

如何在动态生成的文件中插入"_thumb".

How would I insert "_thumb" into files that are being dyanmically generated.

例如，我有一个允许用户上传图像的网站.该脚本获取图像，对其进行优化并保存到文件中.如何为优化后的图像插入字符串"_thumb"?

For example, I have a site that allows users to upload an image. The script takes the image, optimizes it and saves to file. How would I make it insert the string "_thumb" for the optimized image?

我当前正在保存otpimized文件的1个版本. ch-1268312613-photo.jpg

I'm currently saving 1 version of the otpimized file. ch-1268312613-photo.jpg

我想将原始文件另存为上述字符串，但要像以下字符串一样附加"_thumb" ch-1268312613-photo_thumb.jpg

I want to save the original as the above string, but want to append, "_thumb" like the following string ch-1268312613-photo_thumb.jpg

推荐答案

无需使用正则表达式.可以做到这一点:

No need to use regex. This will do it:

$extension_pos = strrpos($filename, '.'); // find position of the last dot, so where the extension starts
$thumb = substr($filename, 0, $extension_pos) . '_thumb' . substr($filename, $extension_pos);

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