3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array_x = array(); $array_x['a'] = array(1,2,3,4); $array_x['b'] = array(2,3,4,5); foreach ($array_x as $k => &$v) { foreach ($v as &$x) { $x = $x * 2; } } var_dump($array_x);
Output for 5.2.1 - 5.6.28, 7.0.0 - 7.1.0
array(2) { ["a"]=> array(4) { [0]=> int(2) [1]=> int(4) [2]=> int(6) [3]=> int(8) } ["b"]=> &array(4) { [0]=> int(4) [1]=> int(6) [2]=> int(8) [3]=> &int(10) } }
Output for hhvm-3.12.0

Process exited with code 137.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.0
array(2) { ["a"]=> &array(4) { [0]=> &int(2) [1]=> &int(4) [2]=> &int(6) [3]=> &int(8) } ["b"]=> &array(4) { [0]=> &int(4) [1]=> &int(6) [2]=> &int(8) [3]=> &int(10) } }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/mJug8 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/mJug8 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/mJug8 on line 7
Process exited with code 255.