3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "1 2 3"; $newStr = preg_replace_callback("/\d+/", function($matches){ return $matches[0] * 2; }, $str); echo $newStr;

This is an error 500

Value for `_results` contains invalid data `array`


preferences:
171.81 ms | 2194 KiB | 9 Q