3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array ( 4004708326000, 4004708392555, 4004708385106 ); $b = array ( 4004708326000, 4004708392555, 4004708285234 ); var_dump(array_diff($a, $b));

preferences:
39.75 ms | 402 KiB | 5 Q