3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ ['Walter', 'White'], ['Marie', 'Schrader'], ['Marie', 'Schrader'], ['Hank', 'Schrader'], ]; var_export( array_unique($array, SORT_REGULAR) );

preferences:
26.55 ms | 405 KiB | 5 Q