3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(0, 1); $b = array(2, 3); foreach($a as &$item) { $item = 10; } foreach($b as $item) { // nothing } var_dump($a); var_dump($b); ?>
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> int(10) [1]=> &int(3) } array(2) { [0]=> int(2) [1]=> int(3) }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
array(2) { [0]=> &int(10) [1]=> &int(3) } array(2) { [0]=> int(2) [1]=> int(3) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/P59n8 on line 6
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 '$' in /in/P59n8 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/P59n8 on line 6
Process exited with code 255.
preferences:
246.32 ms | 401 KiB | 425 Q