用php把数组中偶数，选择出来

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"));