3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array(1, 2, 3, 4); echo key($arr), "=>", current($arr), "\r\n"; foreach ($arr as $key => &$row) { echo key($arr), "=>", current($arr), "\r\n"; }
Output for 5.0.0 - 5.2.1, 7.0.0 - 7.1.0
0=>1 0=>1 0=>1 0=>1 0=>1
Output for 5.2.2 - 5.6.28, hhvm-3.10.0 - 3.12.0
0=>1 1=>2 2=>3 3=>4 =>
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/FsPsO on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/FsPsO on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/FsPsO on line 5
Process exited with code 255.