3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = [1,2,3]; $b = [a,b,c,d,]; if ( sizeof($a) && sizeof($b) ) { echo 'unbelievable'; }
based on ifv2k
Output for 7.2.0
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/7ChGW on line 4 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/7ChGW on line 4 Warning: Use of undefined constant c - assumed 'c' (this will throw an Error in a future version of PHP) in /in/7ChGW on line 4 Warning: Use of undefined constant d - assumed 'd' (this will throw an Error in a future version of PHP) in /in/7ChGW on line 4 unbelievable
Output for 5.4.2 - 7.1.10
Notice: Use of undefined constant a - assumed 'a' in /in/7ChGW on line 4 Notice: Use of undefined constant b - assumed 'b' in /in/7ChGW on line 4 Notice: Use of undefined constant c - assumed 'c' in /in/7ChGW on line 4 Notice: Use of undefined constant d - assumed 'd' in /in/7ChGW on line 4 unbelievable
Output for 5.3.18 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/7ChGW on line 3
Process exited with code 255.