3v4l.org

run code in 300+ PHP versions simultaneously
<?php $A = array(3,4); $B = array(10, 20); foreach ($A as $k => &$i) $i++; foreach ($B as $k => &$i) $i++; var_dump($A); var_dump($B);
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> int(4) [1]=> int(5) } array(2) { [0]=> int(11) [1]=> &int(21) }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
array(2) { [0]=> &int(4) [1]=> &int(5) } array(2) { [0]=> &int(11) [1]=> &int(21) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/TkuI8 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 '$' in /in/TkuI8 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/TkuI8 on line 5
Process exited with code 255.
preferences:
283.2 ms | 401 KiB | 357 Q