Getting Started With Xdebug
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Presented at Pacific Northwest PHP 2015, in the UnCon track.
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Getting Started With Xdebug
- 1. Jeremy Ward Pacific Northwest PHP Conference September 12, 2015 Getting Started With Xdebug
- 2. • Developer at Westwerk • Drummer for Loud Nerves • Board game geek • Fan of stand-up comedy About Me
- 3. • About ‘Debugging’ • Xdebug: Overview, Features, and Benefits • Xdebug Installation and Setup • Application Debugging and Profiling Today’s Topics
- 5. Our Goal
- 7. Understanding Debugging and Context
- 8. Evaluating, understanding, and validating how your application works. What is ‘debugging’?
- 9. var_dump()
- 11. Context Matters
- 12. Xdebug Overview
- 13. • PHP extension that provides debugging and profiling capabilities • Developed by Derick Rethans • First released in May 2002 • Uses the DBGp debugging protocol What is Xdebug?
- 14. • Debugging support • Stack trace view • Profiling • Code coverage analysis • Function logging Features
- 15. • Step through code operations line-by-line • View application data in memory at pre-determined breakpoints • Access function call stack • Update variable values during runtime • More detailed error messaging Benefits
- 16. • Xdebug support exists in over a dozen IDES, including: • PhpStorm • Eclipse • NetBeans • Plain text editors too (with extensions)! • VIM • Sublime Text • Notepad++ Editor Support
- 18. Assumptions
- 19. • Pre-installed w/ some environments (MAMP, XAMPP, Vagrant) • Install from source • PEAR/PECL • Detailed instructions at http://xdebug.org/docs/install Installation
- 20. • Locate php.ini file for your PHP installation • Unsure? Check ‘Loaded Configuration File’ using phpinfo() • Basic settings needed to enable remote debugging: • zend_extension=“/path/to/your/xdebug/extension” • xdebug.remote_enable=1 • xdebug.remote_host=localhost • xdebug.remote_port=9000 • xdebug.remote_autostart=1 Configuration
- 21. • Used primarily in virtual environments such as Vagrant • Helps the server layer find the location of local files • PhpStorm (and presumably other IDEs) include wizards for setting this up Path Mappings
- 22. Using Xdebug
- 23. • Add query parameters to the script you’re trying to load: • Start: [url]?XDEBUG_SESSION_START=[session_name] • Stop: [url]?XDEBUG_SESSION_STOP=[session_name] Enabling/Disabling Xdebug
- 24. • PhpStorm’s website has a list of recommended browser extensions: https://confluence.jetbrains.com/display/PhpStorm/Browser+Debugging +Extensions • Chrome: • Xdebug Helper • Xdebug Enabler • Firefox: • easy Xdebug • The Easiest Xdebug • Safari: • Xdebug Toogler Browser Extensions
- 25. • var_dump() - stylized! • xdebug_break() - pauses the app as if a breakpoint was set • xdebug_get_declared_vars() - returns array of elements defined in the current scope. • Complete list: http://xdebug.org/docs/all_functions Useful functions
- 26. • Profiling • KCacheGrind (Linux) • Webgrind: https://github.com/jokkedk/webgrind • Debugging • MacGDBp (OSX) • Aforementioned browser extensions Tools
- 27. Demo
- 28. • Xdebug website: http://xdebug.org • Xdebug and You: Why You Should Be Using a Real Debugger (Juan Treminio) https://jtreminio.com/2012/07/xdebug-and- you-why-you-should-be-using-a-real-debugger/ • Debugging and Profiling PHP with Xdebug (Shameer C) http://www.sitepoint.com/debugging-and-profiling-php- with-xdebug/ Additional Resources
- 29. Thank You! Feedback http://joind.in/15183 Questions? Email: jeremy@jmichaelward.com Twitter: @_jmichaelward IRC: jmichaelward