Accessing text after last slash in PHP

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PHP

url-rewriting

htaccess

Hi,

Let's say I have the following URL:

https://web.site/a/folder/this+is+a+test

Within a, I have folder.php. How can I access this+is+a+test in that php file? Or would it be better to use mod_rewrite, although I don't want the URL to change?

What I have tried:

.htaccess to rewrite - wasn't happy with URL changing