3v4l.org

run code in 300+ PHP versions simultaneously
<?php $values = [4, 6, 3]; foreach ($values as $k => &$v) { $v = "$k: " . $v * 2; } var_export($values);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => '0: 8', 1 => '1: 12', 2 => '2: 6', )
preferences:
72.38 ms | 406 KiB | 5 Q