Intro to Xdebug

A lazy persons guide to debugging with Xdebug.

1. A minimalists intro to XDEBUG Claudio Mettler, CtrlM Singapore August 2015 1
2. xdebug... • ...provides new functions useful for debugging, logging and testing • ...changes the behaviour of some core PHP functionality • ...does profiling • ...implements a remote debugging protocol 2
3. A word of caution • do not run on live servers (for performance and security reasons) • may cause extreme twitchiness when watching people debug without a debugger 3
4. new functions • code coverage analysis • xdebug_call_class(), xdebug_call_file(), xdebug_call_function(), xdebug_get_headers() • etc. 4
5. Modified behaviour • includes a stack trace in error messages • var_dump can do colors now • function nesting limit of 100! • etc. 5
8. profiling • creates CacheGrind files • topic for another talk 8
9. remote debugging: Installation • pecl install xdebug • apt-get install php5-xdebug • edit config:
 
 xdebug.remote_connect_back=1
 xdebug.remote_enable=1
 9
10. remote debugging: IDE SETUP • accept incoming connections • path mapping 10
11. remote debugging • set breakpoints • enable listener • start session in browser 11
12. live demo 12
13. check out the competition • phpdbg: part of PHP now • zend debugger 13
14. A little bedtime story 14
18. https://speakerdeck.com/claudiomettler/intro-to-xd 18