- print_r: documentation ( source)
- array_flip: documentation ( source)
- array_diff: documentation ( source)
<?php
$array1 = array(
'A' => 10,
'B' => 20,
'C' => 30,
'D' => 40
);
$array2 = array(
'0' => A,
'1' => B,
);
print_r(array_diff($array2, array_flip($array1)));