从数组PHP中计算会话单元

Question

我想从我的购物篮中计算我的$ _SESSION ['购物车']（单位）产品。

#check added stock
            $units = (int) $_POST['units'];
        $sizes_id = (int) $_POST['size_id'];

        $in_stock = $db->GetScalar("SELECT p.units FROM products_sizes s 
                                    INNER JOIN products p ON p.product_id = s.product_id
                                    WHERE s.id = '$sizes_id' LIMIT 1");

        $total = isset($_SESSION['cart'][$sizes_id]) ? $_SESSION['cart'][$sizes_id]['units'] : 0;
        $total += $units;

        if($total <= $in_stock) {
            if(isset($_SESSION['cart'][$sizes_id])) {
                $_SESSION['cart'][$sizes_id]['units'] = $total;
            } else {
                $_SESSION['cart'][$sizes_id] = array('size' => $sizes_id, 'units' => $total);
            }
            $msg = 'Added';
            $status = 1;
        }else {
            $msg = 'Product is not in the basket';
            $status = 0;
        }

这是输出的样子

Array(

[57] => Array
    (
        [size] => 57
        [units] => 5
    )

[56] => Array
    (
        [size] => 56
        [units] => 1
   ) 

)

Answer 1

好的，

<?php
    $total_units = 0;
    foreach ($_SESSION['cart'] as $key => $value) {
        $total_units += $value['units'];
    }

echo $total_units;

＆GT;

应该得到答案

Answer 2

这应该做的工作：

$numUnits = 0;

foreach ($yourArray as $item)
    $numUnits += $item['units'];