3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = array('foo1' => 'foo1', 'foo2' => 'foo2', 'foo3' => 'foo3'); $new = array(); foreach ($foo as $k => $v) { $new[':'.$k] = $v; } var_dump($new);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 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 - 7.1.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { [":foo1"]=> string(4) "foo1" [":foo2"]=> string(4) "foo2" [":foo3"]=> string(4) "foo3" }

preferences:
294.68 ms | 405 KiB | 451 Q