3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = ['a' => 'a', 'b' => 'b']; foreach ($a as &$value) { $value = 'C'; } $value = 'D'; //$value is still bound by-reference echo 'Unintended Results: ' . PHP_EOL; var_dump($a); echo PHP_EOL; $a = ['a' => 'a', 'b' => 'b']; foreach ($a as &$value) { $value = 'C'; } unset($value); $value = 'D'; echo 'Expected Results: ' . PHP_EOL; var_dump($a);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
Unintended Results: array(2) { ["a"]=> string(1) "C" ["b"]=> &string(1) "D" } Expected Results: array(2) { ["a"]=> string(1) "C" ["b"]=> string(1) "C" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/2V2AQ on line 3
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/2V2AQ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/2V2AQ on line 3
Process exited with code 255.
preferences:
82.89 ms | 409 KiB | 5 Q