3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr1 = array(1, 2); $arr2 = array(11, 12); foreach ($arr1 as &$v) { } foreach ($arr2 as &$v) { } var_dump($arr1); var_dump($arr2);
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.26, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.29 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> int(1) [1]=> int(2) } array(2) { [0]=> int(11) [1]=> &int(12) }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
array(2) { [0]=> &int(1) [1]=> &int(2) } array(2) { [0]=> &int(11) [1]=> &int(12) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/vDgXR on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/vDgXR on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/vDgXR on line 5
Process exited with code 255.

preferences:
246.3 ms | 401 KiB | 353 Q