3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function a(){ print_r(debug_traceback); return 1; } function b(){ a(); return 2; } b();
based on l8rhP
Output for 7.2.0
Warning: Use of undefined constant debug_traceback - assumed 'debug_traceback' (this will throw an Error in a future version of PHP) in /in/bbP4l on line 4 debug_traceback
Output for 5.3.20 - 7.1.10
Notice: Use of undefined constant debug_traceback - assumed 'debug_traceback' in /in/bbP4l on line 4 debug_traceback