3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = ['foo' => 'bar', 'foobar' => 'barfoo']; foreach ($arr as $key => &$value) { $value = strrev($value); } var_dump($arr);
Output for 5.6.40, 8.1.23 - 8.1.34, 8.2.10 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.8
array(2) { ["foo"]=> string(3) "rab" ["foobar"]=> &string(6) "oofrab" }

preferences:
78.09 ms | 885 KiB | 4 Q