Debugging and Profiling PHP Applications

May 9, 20141 like1,586 views

This document discusses debugging and profiling PHP applications using Xdebug. It provides instructions for installing Xdebug on different platforms and configuring it for debugging and profiling. It also describes how to trigger debug sessions from PHPStorm, Chrome extensions, and JavaScript bookmarklets. Alternative profiling tools like MCG and XHProf are mentioned as well.

Debugging and Proﬁling
PHP Applications
Logan Lindquist
@llbbl

Debugging vs Proﬁling
Debugging
Bug ﬁxing
Used during Development to minimize bugs
Proﬁling
Performance tuning

Xdebug is AWESOME
Pretty var_dumps
Enhanced 
Stack Trace
Debugging
Proﬁling

OMGWTFBBQ Install it NOW
OSX:
Install homebrew
Follow instructions: https://github.com/Homebrew/homebrew-
php#installation
brew install php54-xdebug
Ubuntu:
sudo apt-get install php5 libapache2-mod-php5 php5-mcrypt
php5-xdebug
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
Windows: Install Vagrant then follow Ubuntu

Conﬁgure Xdebug for
Debugging
Turn on remote debugging:
xdebug.remote_enable=1
Conﬁgure what port, host, log ﬁle ... and more
xdebug.remote_port= 9000
xdebug.remote_log="/var/www/xdebug.log"
xdebug.remote_host="localhost"

Xdebug Proﬁling
xdebug.proﬁler_enable = 1
xdebug.proﬁler_enable_trigger = 1
xdebug.proﬁler_output_dir = "/var/www/xdebug"
xdebug.proﬁler_output_name = xdebug.out.%t

Make sure you have the right PHP
Settings > PHP > Intrepreters
....you should see xdebug

Here is how to check symlinked or not
Tools > Deployment > Conﬁguration

Gotchas
• Make sure proﬁle directory exists and is writeable by
the web server
• Nothing works without xdebug.remote_enable=1
• Make sure port number matches in your ini and
phpstorm. Both default 9000
• SOOOOO many steps ... No shutup, stop being lazy
and just do it

How to trigger a debug session
• Javascript bookmarklets
• Chrome extension
• Within PhpStorm
• Magic
• Production crashes
Let's cover the ﬁrst three
shall we?

Jetbrains Has The Goodies
http://www.jetbrains.com/phpstorm/marklets/
• Start Debugger:
• Goto page
• Hit Start Debugger
• Hit Stop Debugger when done debugging
• Debug this page:
• Goto page
• Hit Debug this page

Chrome Extension
Name: Xdebug Helper
https://chrome.google.com/webstore/detail/xdebug-
helper/eadndfjplgieldjbigjakmdgkmoaaaoc?hl=en

Proﬁling with PhpStorm
Tools > Analyze Xdebug Proﬁler Snapshot

MCG https://itunes.apple.com/us/app/mcg/id799178412?mt=12

XHProf
• Built by Facebook opensourced in 2009
• Xdebug not required
• Way more complicated to setup
• Documentation isn't great
• Requires you to add xhprof methods to your code
• Requires you to conﬁgure apache vhost for reporting
• Has callgraph charts (directed graphs) and a couple other nice features
Install isn't too bad with
homebrew or apt-get

In Review...
• Installed Xdebug
• Setup Xdebug with PhpStorm
• Conﬁgured Xdebug for proﬁling or debugging

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