如何在PHP中基于索引组合2个数组？

Question

$arr1 = array('apple' => 1, 'mango'=>5, 'banana'=>3 );
$arr2 = array('apple' => 3, 'banana'=>2 );

我的结果数组应该是

array('apple'=>4, 'mango'=>5,'banana'=>5);

我怎样才能做到这一点？

Answer 1

你可以做:

foreach($arr2 as $key=>$val) {
        if(isset($arr1[$key])) {
                $arr1[$key] += $val;
        } else {
                $arr1[$key] = $val;
        }   
}

http://www.ideone.com/rDFFW