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<?php $_POST = array('email' => 'abc', 'phone' => '01234'); $possible = array('email', 'phone', 'foo', 'bar', 'baz'); $existing = array_intersect($possible, array_keys($_POST)); var_dump($existing);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(5) "email" [1]=> string(5) "phone" }