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run code in 200+ php & hhvm versions
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<?php $array1 = array("a" => array(1)); $array2 = array("b" => array("1")); $a = array("1" => 1, "2" => 1, "3" => 1, "4" => 1); $b = array("2" => 1, "4" => 1, "5" => 1, "6" => 1); $c = array(1,2,3,4); $d = array(2,4); //$result2 = array_intersect_key($a, $b); // 2 4 $result3 = array_intersect($c,$d); print_r($result2); print_r($result3); ?>
based on OqLuc
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: result2 in /in/1UfNI on line 13 Array ( [1] => 2 [3] => 4 )
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: result2 in /in/1UfNI on line 13 Array ( [1] => 2 [3] => 4 )