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<?php var_dump(in_array("foo", array(0))); var_dump(in_array("foo", array(''))); var_dump(in_array("foo", array(false))); var_dump(in_array("foo", array(null))); var_dump(in_array("foo", array(1))); var_dump(in_array("foo", array(0), true));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
bool(true) bool(false) bool(false) bool(false) bool(false) bool(false)