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<?php $a = ['a', 'b', 'c', 'd']; $b = ['b','x']; var_dump(in_array($b, $a)); var_dump(array_intersect($a,$b));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) array(1) { [1]=> string(1) "b" }

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