3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = "A-MTP-"; $i = 1; $j=1; $s=1; while ($i < 4) { $ch="ch".$s ; $ch= "$".$ch; echo $$ch; while($j < 13) { $j++; } $i++;$s++; }
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: $ch1 in /in/8NRXK on line 10 Notice: Undefined variable: $ch2 in /in/8NRXK on line 10 Notice: Undefined variable: $ch3 in /in/8NRXK on line 10
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: $ch1 in /in/8NRXK on line 10 Notice: Undefined variable: $ch2 in /in/8NRXK on line 10 Notice: Undefined variable: $ch3 in /in/8NRXK on line 10