Debugging Drupal - How to Debug your Drupal Application
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The document discusses techniques and tools for debugging in the Drupal environment, covering PHP configuration, various debugging tools, and strategies for isolating and fixing bugs. It emphasizes understanding symptoms, context, and using tools like debug_backtrace, drush, and logging to effectively identify issues. Moreover, it highlights the contributions of Zyxware Technologies to the Drupal community and their commitment to promoting free software.
Debugging Drupal - How to Debug your Drupal Application
- 1. Debugging with Drupal The art of Debugging Anoop John, CTO Vimal Joseph, Technical Architect
- 2. The Art of Debugging Bugs everywhere... SA-CORE-2014-005
- 3. The Art of Debugging Bug-free Software?
- 4. The Art of Debugging Debugging It's hard enough to find an error in your code when you're looking for it; it's even harder when you've assumed your code is error-free. Steve McConnel
- 5. The Art of Debugging Story Time Tell us a story on your debugging experience
- 6. The Art of Debugging Set up Debugging Environment PHP configuration (php.ini) display_errors = On log_errors = On error_reporting = E_ALL | E_STRICT Drupal modules Devel A good editor Geany Emacs is better – but learning curve is bit steep. Learn to setup a development environment for a given project quickly. Drush will help.
- 7. The Art of Debugging Debugging Tools - PHP Basic PHP print/echo print_r() exit()/die() debug_backtrace()/debug_print_backtrace()
- 8. The Art of Debugging Debugging Tools - Drupal drupal_set_message() watchdog() Views views_trace() Devel dpm() dargs() dd() ddebug_backtrace() db_queryd()
- 9. The Art of Debugging Debugging Tools - HTML, JS, CSS Firebug Web Developer Toolbar Javascript debugger
- 10. The Art of Debugging Debugging Tools - CLI Drush – a life saver. archive-dump, archive-restore, vget, vset, php- eval, sql-cli, sql-query, user-login etc.. Xdebug cat, grep, awk, cut
- 11. The Art of Debugging General Approach for Debugging Understand the symptom Understand the context Define problem statement Replicate bug Read through code Isolate location in code causing bug Understand code Understand data / context Understand cause Identify solution Fix bug
- 12. The Art of Debugging Tips for Debugging Code Trial and error may work – but do not rely on that Binary search is the best method to isolate a bug Learn to navigate through code Learn to read logs Webserver Access/Error logs Database Error logs Drupal error logs Be familiar with the shell commands cat, zcat, grep, less etc..
- 13. The Art of Debugging Errors, Notices, Warnings Warning: htmlspecialchars() expects parameter 1 to be string, array given in check_plain() (line 1566 of /var/www/d7/includes/bootstrap.inc). Invalid argument supplied for foreach() in /var/www/d7/includes/common.inc on line 1919. Illegal offset type in isset or empty in /home/pgil1/public_html/modules/taxon omy/taxonomy.module on line 1090.
- 14. The Art of Debugging Backtrace – your guide views_trace debug_backtrace debug_print_backtrace ddebug_backtrace
- 15. The Art of Debugging Tips for Debugging Code // function drupal_set_message() bootstrap.inc if ($type == 'error') { // here are some alternatives – views_trace() // is part of views module // $message .= '<pre>' . print_r(debug_backtrace(), TRUE) . '</pre>'; // $message .= '<pre>' . views_trace() . '</pre>'; } // Or in function watchdog() bootstrap.inc if ($type == 'php') { $message .= '<pre>'. print_r(debug_backtrace(), 1) .'</pre>'; //$message .= '<pre>'. views_trace() .'</pre>'; } // Or in the function which error occurred ddebug_backtrace(); or dpm() or print_r() //make sure to add the necessary conditions so that the debug
- 16. The Art of Debugging Tips for Debugging Code // Debuging cron // module_invoke() module.inc if ($hook == 'cron') { watchdog('debugging', "CRON: Calling $module"); } // Errors like “Cannot use object of type stdClass as array” // Insert right before the moment of disaster if (!is_array($x)) { dpm(ddebug_backtrace(TRUE)); }
- 17. The Art of Debugging Tips for Debugging HTML, CSS, JS Inspect using Firebug Create test HTML Set custom properties Walk through JS code execution Inspect variables
- 18. Zyxware Technologies and Drupal Zyxware is a leading contributor to Drupal from India and is one of only six Featured Service Providers from India listed on drupal.org ● Over 40,000 websites use our modules and themes ● More than 30 contributed modules and themes ● Maintainer of Search404, a top 100 Drupal module ● Over 1000 commits at drupal.org ● Contributes all patches back to Drupal ● Our profile on drupal.org - http://drupal.org/user/222163 ● Knowledge partnerships with Acquia, New Relic and Volacci
- 19. ● Freedom Walk, a 44 day walk by a team of Free Software Evangelists across the length of Kerala to promote Free Software ● Building RithuOS, an Operating System for Engineering students with Free Software Engineering applications ● GNU/Linux Install Fests in Schools, Colleges and at Technopark. ● Local language (Malayalam) computing camps in colleges ● Building and Maintenance of Freedom Toaster, a Free Software kiosk ● Conducting Free Software workshops and lectures in colleges in Kerala Free Software and Zyxware Technologies
- 20. • Check us out at http://www.zyxware.com • Mail us at drupal@zyxware.com • Like us at http://www.facebook.com/zyxware • Follow us at http://www.twitter.com/zyxware • Connect with us at http://www.linkedin.com/companies/zyxware-technologies • Talk to us at +91-9495969446 between 9AM - 9PM IST • Skype me at aj_zyxware Contact Us
- 21. The Art of Debugging Thank you …
- 22. The Art of Debugging Credits http://randyfay.com/content/debugging-techniques http://www.lullabot.com/articles/quick_and_dirty_de bugging