I have a website online that's mainly built up on PHP and consists of 40,000-something files.

When using the W3 Validator tool to find errors in my code, it produces around 20 errors and shows which line is the problem but it doesn't say in which file (PHP, TPL etc.). I tried using software called Agent Ransack to search the contents of the files but even that can't find the code.

Is there any way I can find out exactly which file is containing the code with errors?