3v4l.org

run code in 300+ PHP versions simultaneously
<?php $hexColor = '012'; echo implode('', array_map(function($color){ return str_repeat($color, 2); }, str_split($hexColor))); echo PHP_EOL; echo preg_replace("~([0-9a-f])~", "\1\1", $hexColor); echo PHP_EOL;
preferences:
47.03 ms | 402 KiB | 5 Q