Online PHP editor | refs for osANs

@ 2018-08-20T09:46:04Z

<?php

$key_val1 = [
    101 => 2,
    102 => 1,
    103 => 3,
    104 => 2
];

$key_val2 = [
    101 => 2,
    104 => 2,
    103 => 1
];

foreach ($key_val1 as $key => &$value) {
    if (array_key_exists($key, $key_val2)) {
        $value -= $key_val2[$key];
    }
}
unset ($value);

print_r($key_val1);