[Jake]

Does a free PHP debugger exist on a Linux System

[Krabik]

PHP already has pretty good debugging. Like for PHP-MySQL in a MySQL query you could go something like:
DoThisSQLQuery(sqlQuery) or die(mysql_error());

If you don't see any line errors you could always go to your php.ini file & make sure that errors are being displayed (I forgot the option name)...

To track bugs I always use: die("This is close to the error that I'm debugging for");
And it has always worked. Hmmm

[Jake]

I agree

[WarChild]

Zend Studio has a buit-in debugger, but the program is not free.