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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array('e' => 22, 'r' => 66, 't' => 88); $b = array('t' => 65); array_walk($a, function(&$value) { $value = 'e ' . $value; print $value ."\n"; }); print_r($a);
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
e 22 e 66 e 88 Array ( [e] => e 22 [r] => e 66 [t] => e 88 )
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/pkbbL on line 5
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/pkbbL on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pkbbL on line 5
Process exited with code 255.