- array_intersect_key: documentation ( source)
- array_intersect: documentation ( source)
- print_r: documentation ( source)
<?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);
$result2 = array_intersect_key($a, $b); // 2 4
$result3 = array_intersect($a,$b);
print_r($result2);
print_r($result3);
?>