Use php to select an even number in the array

Use php to select an even number in the array. I have such a small algorithm that selects all the even numbers or technologies in the array. Many people may loop through this array, but I can do this without repeating the array. the code is as follows.

Function odd ($ var) {// returns whether the input integer is odd return ($ var & 1);} function even ($ var) {// returns whether the input integer is even return (! ($ Var & 1) ;}$ array1 = array ("a" => 1, "B" => 2, "c" => 3, "d" => 4, "e" => 5); $ array2 = array (6, 7, 8, 9, 10, 11, 12); echo "Odd: \ n "; print_r (array_filter ($ array1," odd "); echo" Even: \ n "; print_r (array_filter ($ array2," even "));