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

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