3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array = array("a" => "3", "b" => "2", "c" => "1"); foreach($array as $key => &$val) { $val = $key; echo $val; } foreach($array as &$val) { echo $val; }
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
abcabc
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/otJcn on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/otJcn on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/otJcn on line 4
Process exited with code 255.