3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('a'=>1,'b'=>2,'c'=>3); var_dump(array_reduce($a, function($result, $item) use ($a) { $key = $result ? key($result) : $a; $key = $key == 'a' ? 'aa' : $key; $result[$key] = $item; return $result; }));
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: Illegal offset type in /in/dUj77 on line 7 Warning: Illegal offset type in /in/dUj77 on line 7 Warning: Illegal offset type in /in/dUj77 on line 7 array(0) { }
Output for hhvm-3.12.0
Warning: Invalid operand type was used: Invalid type used as key in /in/dUj77 on line 7 Warning: Illegal offset type in /in/dUj77 on line 7 Warning: Illegal offset type in /in/dUj77 on line 7 array(0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/dUj77 on line 4
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 T_FUNCTION in /in/dUj77 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/dUj77 on line 4
Process exited with code 255.