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<?php function array_key_match($target, $match) { $targetKeys = array_keys($target); $diff = array_diff($target, $match); return ($diff == array_diff($diff, $match)); } print_r(array_diff([1, 2, 3, 4], [1, 4])); function test($target, $match, $expect) { return sprintf( "Target %s, Match %s: %s\n", var_export($target, true), var_export($match, true), (array_key_match($target, $match) == $expect) ? 'true' : 'false' ); } print test([1, 2, 3, 4, 5], [2, 3], true); print test(['a', 'b', 'c'], ['c', 'b'], true); print test([1, 2, 3, 4, 5], [4, 5, 6], false);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [1] => 2 [2] => 3 ) Target array ( 0 => 1, 1 => 2, 2 => 3, 3 => 4, 4 => 5, ), Match array ( 0 => 2, 1 => 3, ): true Target array ( 0 => 'a', 1 => 'b', 2 => 'c', ), Match array ( 0 => 'c', 1 => 'b', ): true Target array ( 0 => 1, 1 => 2, 2 => 3, 3 => 4, 4 => 5, ), Match array ( 0 => 4, 1 => 5, 2 => 6, ): false

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