问循环PHP以检查值并接受如果满足条件

EN

$items = [3,4,6]; //can also be used as an associative array with "item1" => 3 likewise
$requiredQuantity = 9;
$currentQuantity = 0;

$i = 0; //incrementor
foreach ($items as $item){
    if(($currentQuantity+$item) < $requiredQuantity){
        $currentQuantity += $item;
        $items[$i] = 0;
    }
    elseif(($currentQuantity+$item) == $requiredQuantity){
        $currentQuantity += $item;
        $items[$i] = 0;
        break;
    }
    else{
        $shortageQuantity = $requiredQuantity - $currentQuantity;
        $items[$i] -= $shortageQuantity;
        $currentQuantity += $shortageQuantity;
        break;
    }
    $i++;
} //end of foreach loop

print_r($items); //resultant items list.