3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = ['green', '', 'red', '', 'blue']; var_export( array_values(array_filter($array) + $array) );
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 'green', 1 => 'red', 2 => 'blue', 3 => '', 4 => '', )
preferences:
51.73 ms | 844 KiB | 4 Q