Debugging PHP With Xdebug
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Debugging in PHP can be tedious and prone to error when using var_dump and echo statements. Learn how to debug more effectively and get better insight into an application by using Xdebug. See how to setup PHPStorm, Xdebug, and the browser to enable debugging that will let you step into code and see variable values live. Extend those debugging capabilities into REST and SOAP clients to increase the code that can be debugged with ease.
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Debugging PHP With Xdebug
- 1. D E B U G G I N G P H P W I T H X D E B U G M A R K N I E B E R G A L L https://joind.in/talk/14128
- 2. A B O U T M A R K N I E B E R G A L L • PHP since 2005 • Masters degree in MIS • Senior Software Engineer • Team Lead • Drug screening project • President of Utah PHP User Group (UPHPU) • SSCP, CSSLP Certified and SME for (ISC)2 • PHP, databases, JavaScript • Drones, fishing, skiing, father, husband
- 3. A B O U T M A R K N I E B E R G A L L
- 4. D E B U G G I N G P H P W I T H X D E B U G UPHPU • Third Thursday of each month at 7pm • Venue is Vivint in Lehi (3401 Ashton Blvd) • Variety of PHP related topics • Mostly local speakers, occasional traveling speaker • Networking with other developers, companies • Professional development • uphpu.org
- 5. D E B U G G I N G P H P W I T H D E B U G
- 6. D E B U G G I N G P H P W I T H X D E B U G Overview • What is Xdebug • Why use Xdebug • Setting up Xdebug • Using Xdebug
- 7. W H AT I S X D E B U G
- 8. W H AT I S X D E B U G
- 9. W H AT I S X D E B U G Xdebug • Available since 2002 • Developed initially by Derick Rethans • PHP extension • Written in C • Open source • Used for debugging and profiling • Uses DeBugGer Protocol (DBGp) for communication
- 10. W H Y U S E X D E B U G
- 11. W H Y U S E X D E B U G Debugging without Xdebug
- 12. W H Y U S E X D E B U G Debugging without Xdebug • echo $something; • var_dump($other); • print_r($data); • error_log(__FILE__ . ‘ line ‘ . __LINE__);
- 13. W H Y U S E X D E B U G Debugging without Xdebug • Add outputs • Load page • Look for output • Change some code • Add more outputs • Repeat • Cleanup outputs without missing any • Load page
- 14. W H Y U S E X D E B U G Debugging with Xdebug
- 15. W H Y U S E X D E B U G Debugging with Xdebug • Add breakpoint(s) • Load page • Step into the code
- 16. W H Y U S E X D E B U G Debugging with Xdebug • Live values • Follow actual code path • Full stacktrace
- 17. W H Y U S E X D E B U G Debugging with Xdebug • Supported by most IDEs • Faster development time • Better understanding of what code is actually doing • Does not require code changes to interrogate values
- 18. S E T T I N G U P X D E B U G
- 19. S E T T I N G U P X D E B U G Fire up you development environment
- 20. S E T T I N G U P X D E B U G Documentation from JetBrain for PhpStorm https://confluence.jetbrains.com/display/PhpStorm/Zero-configuration+Web +Application+Debugging+with+Xdebug+and+PhpStorm 1. Install Xdebug 2. Prepare PhpStorm 3. Set a breakpoint in the source code 4. Activate debugger on server 5. Start a debug session in browser 6. Reload the current page 7. Set initial path mappings
- 21. S E T T I N G U P X D E B U G 1. Install Xdebug
- 22. S E T T I N G U P X D E B U G 1. Install Xdebug • https://xdebug.org/docs/install
- 23. S E T T I N G U P X D E B U G 1. Install Xdebug • Download (if applicable) • Install or compile • Configure PHP • Restart webserver
- 24. S E T T I N G U P X D E B U G 1. Install Xdebug • Windows: - Xdebug website has a wizard, dll downloads • Mac: - sudo pecl install xdebug - brew install php70-xdebug • Linux: - wget http://xdebug.org/files/xdebug-2.4.0.tgz - sudo pecl install xdebug
- 25. S E T T I N G U P X D E B U G 1. Install Xdebug • Windows: download dll - Xdebug website has a wizard, downloads - Paste php -i or phpinfo() (ex: C:phpphp -i > C: phpphpinfo.txt or <?php phpinfo();) - dll download link provided - Add a line to your php.ini file - Restart webserver
- 26. S E T T I N G U P X D E B U G 1. Install Xdebug • apt-get install php5-xdebug • wget http://xdebug.org/files/xdebug-2.4.0.tgz tar -xzvf xdebug-2.4.0.tgz cd xdebug-2.4.0 phpize ./configure --enable-xdebug make make install
- 27. S E T T I N G U P X D E B U G 1. Install Xdebug • yum install php-devel yum install php-pear pecl install xdebug • dnf install php-devel dnf install php-pear pecl install xdebug
- 28. S E T T I N G U P X D E B U G 1. Install Xdebug • Update php.ini by adding lines: zend_extension = php_xdebug-2.4.0-5.5-vc11.dll [xdebug] xdebug.remote_enable = 1 xdebug.remote_port = 9000 xdebug.remote_host = localhost xdebug.idekey = PHPSTORM
- 29. S E T T I N G U P X D E B U G 1. Install Xdebug • Update php.ini by adding lines: zend_extension = /usr/lib64/php/modules/xdebug.so [xdebug] xdebug.remote_enable = 1 xdebug.remote_port = 9000 xdebug.remote_host = localhost xdebug.idekey = PHPSTORM
- 30. S E T T I N G U P X D E B U G 1. Install Xdebug • Restart webserver - Windows: Services Apache Monitor - Linux: sudo apachectl restart sudo service nginx restart
- 31. S E T T I N G U P X D E B U G 1. Install Xdebug • Verify via phpinfo - <?php phpinfo(); - php -i | grep xdebug
- 32. S E T T I N G U P X D E B U G 1. Install Xdebug • Verify via phpinfo
- 33. S E T T I N G U P X D E B U G 2. Prepare PhpStorm
- 34. S E T T I N G U P X D E B U G 2. Prepare PhpStorm • Start Listening for PHP Debug Connections
- 35. S E T T I N G U P X D E B U G 2. Prepare PhpStorm
- 36. S E T T I N G U P X D E B U G 2. Prepare PhpStorm
- 37. S E T T I N G U P X D E B U G 2. Prepare PhpStorm • Setup debug settings
- 39. S E T T I N G U P X D E B U G 2. Prepare PhpStorm • Setup project path mapping
- 40. S E T T I N G U P X D E B U G 2. Prepare PhpStorm
- 41. S E T T I N G U P X D E B U G 3. Set a breakpoint in the source code
- 42. S E T T I N G U P X D E B U G 3. Set a breakpoint in the source code • Line you know will be hit • Or break on first line
- 44. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 45. S E T T I N G U P X D E B U G 4. Activate debugger on server • Browser plugin, add-on - The easiest Xdebug (Firefox) - Xdebug Helper (Chrome) - Xdebug Toggler (Safari) - Xdebug launcher (Opera)
- 46. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 47. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 48. S E T T I N G U P X D E B U G 4. Activate debugger on server • URL - GET: &XDEBUG_SESSION_START=PHPSTORM - POST: XDEBUG_SESSION_START=PHPSTORM • Headers - Name: Cookie - Value: XDEBUG_SESSION=PHPSTORM • Bookmarklet
- 49. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 50. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 51. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 52. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 53. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 54. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 55. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 56. S E T T I N G U P X D E B U G 5. Start a debug session in browser
- 57. S E T T I N G U P X D E B U G 5. Start a debug session in browser • Click the debug button in toolbar • Add GET, POST, or COOKIE
- 58. S E T T I N G U P X D E B U G 6. Reload the current page
- 59. S E T T I N G U P X D E B U G 6. Reload the current page
- 60. S E T T I N G U P X D E B U G 7. Set initial path mappings
- 61. S E T T I N G U P X D E B U G 7. Set initial path mappings
- 62. U S I N G X D E B U G
- 63. U S I N G X D E B U G
- 64. U S I N G X D E B U G • Breakpoints • Stepping through code • Watches • Console
- 65. U S I N G X D E B U G
- 66. U S I N G X D E B U G Breakpoints • Pause code execution at specific line • Allowed multiple breakpoints • Conditional breakpoints
- 67. U S I N G X D E B U G Breakpoints • Place strategically • Not too early • Not too late • Not too many • Remember time limit, increase if needed • Use conditional breakpoints in loops
- 68. U S I N G X D E B U G Breakpoints
- 69. U S I N G X D E B U G Breakpoints
- 70. U S I N G X D E B U G Stepping through code
- 71. U S I N G X D E B U G Stepping through code • Resume Program (Play) • Stop • View Breakpoints • Disable All Breakpoints
- 72. U S I N G X D E B U G Stepping through code • Step Over • Step Into • Force Step Into • Step Out • Run to Cursor
- 73. U S I N G X D E B U G Stepping through code • Evaluate Expression • Show value addresses • Hide empty superglobal variables (on by default) • Add method to skip list
- 74. U S I N G X D E B U G Watches
- 75. U S I N G X D E B U G Watches • Live updates • Values • Expressions
- 76. U S I N G X D E B U G Console
- 77. U S I N G X D E B U G Console • Output from debugging expressions • Enter expressions to be evaluated
- 78. S U M M A RY
- 79. S U M M A RY • More efficient way to debug • Visibility into code • Ability to change code on the fly • Watch values change line by line • Better understanding of code path
- 80. Q U E S T I O N S ? https://joind.in/talk/14128
- 81. S O U R C E S • JetBrains documentation https://confluence.jetbrains.com/display/PhpStorm/Zero- configuration+Web+Application+Debugging+with+Xdebug+and+PhpStorm • Xdebug documentation https://xdebug.org/docs/install • David Stockton, php[architect], January 2015, https://www.phparch.com/wp- content/uploads/2015/01/levelup-xdebug-phparchitect-jan2015.pdf