<?php
$a = array('a' => 1, 'b' => 2, 'c' => 2, 'd' => 2, 'e' => 2, 'f' => 2);
$b = array('a', 'b', 'd', 'g', 'apple');
$c = compare_plus($a, $b);
print_r($c);
function compare_plus($arr, $plusarr){
foreach($plusarr as $key)
if (array_key_exists($key, $arr))
$arr[$key]++;
return $arr;
}