$arr = array('Hello','World!','Beautiful','Day!'); echo join(", ",$arr);
$array1 = [1, 5, 64, 2, 6]; $array2 = [2, 1, 8, 3]; //Method 1: array_filter($array1, function($_){ global $array2; return in_array($_, $array2); }); // Output: [0 => 1, 3 => 2] //Method 2: array_intersect($array1, $array2); //Output: [0 => 1, 3 => 2]