3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array = ['foo'=>1, 'bar'=>2]; foreach($array as $k=>&$v) { $array['bernard']=3; echo key($v); }
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: key() expects parameter 1 to be array, integer given in /in/0B4UF on line 7 Warning: key() expects parameter 1 to be array, integer given in /in/0B4UF on line 7 Warning: key() expects parameter 1 to be array, integer given in /in/0B4UF on line 7
Output for hhvm-3.10.0 - 3.12.0
Warning: Invalid operand type was used: expecting an array in /in/0B4UF on line 7 Warning: Invalid operand type was used: expecting an array in /in/0B4UF on line 7 Warning: Invalid operand type was used: expecting an array in /in/0B4UF on line 7
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/0B4UF on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/0B4UF on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0B4UF on line 3
Process exited with code 255.