PHP Foreach查询检查

Question

Array
(
    [0] => Array
        (
            [cart_id] => 24763
            [product_id] => 740
            [name] => Samsung S20
            [model] => Samsung S20
            [shipping] => 1
            [image] => catalog/samsung/samsungs20.jpg
            [option] => Array
                (
                )

            [download] => Array
                (
                )
        )

    [1] => Array
        (
            [cart_id] => 24799
            [product_id] => 749
            [name] => Huawei P40
            [model] => Huawei P40
            [shipping] => 1
            [image] => catalog/huawei/huaweip40.jpg
            [option] => Array
                (
                )

            [download] => Array
                (
                )
        )

)

上面是数组的输出。

$productdata = $this->cart->getProducts(); 

以上是查询出数组的代码。

是否有检查每个数组的product_id？假设product_id = 749，警报('P40')；

试着做

foreach ($productdata as $productdatas) {
    if ($productdata['product_id'] = 749)
    { alert('P40'); 
    }

}

什么都没发生

Answer 1

这部分设置钥匙，而不是阅读它。您需要将=替换为==

// From
if ($productdata['product_id'] = 749)

// To
if ($productdata['product_id'] == 749)