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run code in 200+ php & hhvm versions
Bugs & Features
<?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 - 7.2.0
array(2) { [0]=> string(5) "email" [1]=> string(5) "phone" }