3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8); $b = array(1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8,1,2,3,4,5,6,7,9,8); $c = array(1,2,3,4); $d = array(2,4); //print_r($x); //print_r($y); $x = array_flip($a); $y = array_flip($b); $x = array_intersect_key($x, $y); // 2 4 $x = array_flip($x); //$y = array_flip($y); $x = array_intersect($a,$b); //print_r($result2); print_r($x); //print_r($result3); ?>

preferences:
38.98 ms | 402 KiB | 5 Q