3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = "abc"; echo $x[] += 1;
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: [] operator not supported for strings in /in/aU1mU:3 Stack trace: #0 {main} thrown in /in/aU1mU on line 3
Process exited with code 255.
Output for 4.3.2 - 5.6.28
Fatal error: [] operator not supported for strings in /in/aU1mU on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: [] operator not supported for strings in /in/aU1mU on line 3