"apple", "b"=>"ball", "c"=>"cat", "dog"); $array2 = array("A"=>"ant", "B"=>"ball", "C"=>"camel"); $array3 = array("a"=>"airplane", "b"=>"ball"); // Computing the intersection $result = array_intersect_uassoc($array1, $array2, $array3, "strcasecmp"); print_r($result); ?>