A PHP debugger “extension” handles debugging PHP code. One of the most popular extensions is the Xdebug, a free PHP debugger, which is installed as a dynamic link library on Windows or as a ...

But it has absolutely no debugging support for PHP. It understands PHP syntax, but if you want to debug something, you have to drop in the equivalent of print statements throughout your code.

After two decades of PHP, sites still expose sensitive details via debug mode In 2018, some developers fail to deactivate debug mode for their web apps, leading to potentially catastrophic scenarios.

I don't know what support for debugging PHP has (presumably it's better than just "stick some printfs () in the code") -- I know with mod_perl, you can use the Perl debugger if you like, or choose ...