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<?php var_dump(array_search('pizza', array_flip(array('pizza' => 'pie', 'mushroom' => 'salsa')))); var_dump(array_search('onions', array_flip(array('pizza' => 'pie', 'mushroom' => 'salsa'))));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(3) "pie" bool(false)