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);

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49.04 ms | 402 KiB | 5 Q