3v4l.org

run code in 300+ PHP versions simultaneously
<?php $keys = ['a','b','c','d','e','f','g','h','i','z']; $private = [ 'a','b','c','d' ]; $aliases = [ 'z' => 'a' ]; print_r(array_intersect_key(array_flip($aliases), $private));

preferences:
29.59 ms | 402 KiB | 5 Q