<?php
$arr1 = array('9' => '4.08', '10' => '0.10', '11' => '4.08', '12' => '0.01');
$arr2 = array('8' => '0.01', '10' => '0.01', '11' => '0.01');
$arr3 = $arr1 + $arr2;
$arr4 = array_intersect_key($arr2, $arr1);
foreach($arr4 as $k => $v) {
$arr3[$k] += $v;
}
print_r($arr3);
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