如何计算php中多维数组中元素的出现次数和数量值？

Question

我有以下数组，我想知道如何才能接收到具有qty-s的唯一产品ID，例如：

product 805 - 1 piece
product 1118 - 2+3+4 = 9pieces

array(2){
    ["product"]=> array(4){    
        [0]=> string(3) "805"     
        [1]=> string(4) "1118"     
        [2]=> string(4) "1118"     
        [3]=> string(4) "1118"     
    }     
    ["qty"]=> array(4) {      
        [0]=> string(1) "1"         
        [1]=> string(1) "2"     
        [2]=> string(1) "3"     
        [3]=> string(1) "4"     
    }    
}    

提前感谢！

Answer 1

$productQuantities = array();
$products = array("805","1118","1118","1118");
$quantities = array(1,2,3,4);
foreach($products AS $key=>$productId){
    $quantity = (int) $quantities[$key];
    if(isset($productQuantities[$productId])){
        $productQuantities[$productId] += $quantity;
    } else {
        $productQuantities[$productId] = $quantity;
    }
}

var_dump($productQuantities);