Debugging PHP with Xdebug - PHPUK 2018
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The document discusses using Xdebug to debug PHP code. It begins with an overview of Xdebug, explaining that it is a PHP extension that allows for step-by-step debugging and profiling of PHP applications. It then covers how to set up Xdebug, including installing the extension, configuring an IDE like PhpStorm to work with it, setting breakpoints in code, and activating the debugger. Finally, it discusses how to use Xdebug, such as setting and working with breakpoints, stepping through code, and using watches and the console window. The overall document serves as an introduction to debugging PHP applications with Xdebug.
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![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-2.6.0-7.2-vc15-nts-x86_64.dll
[xdebug]
xdebug.remote_enable = 1
xdebug.remote_autostart = 1
xdebug.remote_port = 9000
xdebug.remote_host = localhost
xdebug.idekey = PHPSTORM](https://image.slidesharecdn.com/debuggingphpwithxdebug-phpuk-180214231203/85/Debugging-PHP-with-Xdebug-PHPUK-2018-32-320.jpg)
![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_autostart = 1
xdebug.remote_port = 9000
xdebug.remote_host = localhost
xdebug.idekey = PHPSTORM](https://image.slidesharecdn.com/debuggingphpwithxdebug-phpuk-180214231203/85/Debugging-PHP-with-Xdebug-PHPUK-2018-33-320.jpg)
![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
• https://sievertschreiber.files.wordpress.com/2010/04/crane-truck-double-fail.jpg](https://image.slidesharecdn.com/debuggingphpwithxdebug-phpuk-180214231203/85/Debugging-PHP-with-Xdebug-PHPUK-2018-87-320.jpg)
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Debugging PHP with Xdebug - PHPUK 2018
- 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/50bee
- 3. D E B U G G I N G P H P W I T H X D E B U G
- 4. 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 • Drug screening project • UPHPU President • CSSLP, SSCP Certified and SME • Drones, fishing, skiing, father, husband
- 5. A B O U T M A R K N I E B E R G A L L • Manchester • Nelson • Workington
- 6. A B O U T M A R K N I E B E R G A L L
- 7. A B O U T M A R K N I E B E R G A L L
- 8. 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
- 9. W H AT I S X D E B U G
- 10. W H AT I S X D E B U G
- 11. W H AT I S X D E B U G Xdebug • Step-into debugger • Profiler • DeBugGer Protocol (DBGp) for communication
- 12. 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
- 13. W H Y U S E X D E B U G
- 14. W H Y U S E X D E B U G Debugging without Xdebug
- 15. 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__);
- 16. W H Y U S E X D E B U G Debugging without Xdebug 1. Add outputs 2. Load page 3. Look for output 4. Change some code 5. Add more outputs 6. Repeat 7. Cleanup outputs without missing any 8. Load page
- 17. W H Y U S E X D E B U G Debugging with Xdebug
- 18. W H Y U S E X D E B U G Debugging with Xdebug 1. Turn on debugging 2. Add breakpoint(s) 3. Load page 4. Step into the code
- 19. W H Y U S E X D E B U G Debugging with Xdebug • Live values • Follow actual code path • Full stacktrace
- 20. 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
- 21. S E T T I N G U P X D E B U G
- 22. S E T T I N G U P X D E B U G Fire up you development environment
- 23. 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
- 24. S E T T I N G U P X D E B U G 1. Install Xdebug
- 25. S E T T I N G U P X D E B U G 1. Install Xdebug • https://xdebug.org/docs/install
- 26. 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
- 27. S E T T I N G U P X D E B U G 1. Install Xdebug • git clone https://github.com/xdebug/xdebug.git • cd xdebug • ./rebuild.sh
- 28. 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 php72-xdebug • Linux: - wget http://xdebug.org/files/xdebug-2.6.0.tgz - sudo pecl install xdebug
- 29. 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
- 30. S E T T I N G U P X D E B U G 1. Install Xdebug • apt-get install php-xdebug • wget http://xdebug.org/files/xdebug-2.6.0.tgz tar -xzvf xdebug-2.6.0.tgz cd xdebug-2.6.0 phpize ./configure --enable-xdebug make make install
- 31. 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
- 32. 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-2.6.0-7.2-vc15-nts-x86_64.dll [xdebug] xdebug.remote_enable = 1 xdebug.remote_autostart = 1 xdebug.remote_port = 9000 xdebug.remote_host = localhost xdebug.idekey = PHPSTORM
- 33. 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_autostart = 1 xdebug.remote_port = 9000 xdebug.remote_host = localhost xdebug.idekey = PHPSTORM
- 34. 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
- 35. 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
- 36. S E T T I N G U P X D E B U G 1. Install Xdebug • Verify via phpinfo
- 37. S E T T I N G U P X D E B U G 1. Install Xdebug • Verify via phpinfo
- 38. S E T T I N G U P X D E B U G 2. Prepare PhpStorm
- 39. S E T T I N G U P X D E B U G 2. Prepare PhpStorm • Start Listening for PHP Debug Connections
- 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 2. Prepare PhpStorm
- 42. S E T T I N G U P X D E B U G 2. Prepare PhpStorm • Setup debug settings
- 44. S E T T I N G U P X D E B U G 2. Prepare PhpStorm • Setup project path mapping
- 45. S E T T I N G U P X D E B U G 2. Prepare PhpStorm
- 46. S E T T I N G U P X D E B U G 3. Set a breakpoint in the source code
- 47. 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
- 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 • Browser plugin, add-on - The easiest Xdebug (Firefox) - Xdebug Helper (Chrome) - Xdebug Toggler (Safari) - Xdebug launcher (Opera)
- 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 • URL - GET: &XDEBUG_SESSION_START=PHPSTORM - POST: XDEBUG_SESSION_START=PHPSTORM • Headers - Name: Cookie - Value: XDEBUG_SESSION=PHPSTORM • Bookmarklet
- 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 4. Activate debugger on server
- 57. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 58. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 59. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 60. S E T T I N G U P X D E B U G 4. Activate debugger on server
- 61. S E T T I N G U P X D E B U G 5. Start a debug session in browser
- 62. 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
- 63. S E T T I N G U P X D E B U G 6. Reload the current page
- 64. S E T T I N G U P X D E B U G 6. Reload the current page
- 65. S E T T I N G U P X D E B U G 7. Set initial path mappings
- 66. S E T T I N G U P X D E B U G 7. Set initial path mappings
- 67. U S I N G X D E B U G
- 68. U S I N G X D E B U G
- 69. U S I N G X D E B U G • Breakpoints • Stepping through code • Watches • Console
- 70. U S I N G X D E B U G
- 71. U S I N G X D E B U G Breakpoints • Pause code execution at specific line • Allowed multiple breakpoints • Conditional breakpoints
- 72. 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
- 73. U S I N G X D E B U G Breakpoints
- 74. U S I N G X D E B U G Breakpoints
- 75. U S I N G X D E B U G Stepping through code
- 76. U S I N G X D E B U G Stepping through code • Resume Program (Play) • Stop • View Breakpoints • Disable All Breakpoints
- 77. 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
- 78. 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
- 79. U S I N G X D E B U G Watches
- 80. U S I N G X D E B U G Watches • Live updates • Values • Expressions
- 81. U S I N G X D E B U G Console
- 82. U S I N G X D E B U G Console • Output from debugging expressions • Enter expressions to be evaluated
- 83. S U M M A RY
- 84. 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
- 85. D I S C U S S I O N • Setup issues • Remote debugging • Profiling • Xdebug vs alternative methods
- 86. Q U E S T I O N S ? https://joind.in/talk/50bee
- 87. 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 • https://sievertschreiber.files.wordpress.com/2010/04/crane-truck-double-fail.jpg