[英]array_key_exists() expects parameter 2 to be array, null given - Cakephp 3
Friends, I appreciate any comments.朋友们,我感谢任何意见。
I'm having problems with array_key_exists.我遇到了 array_key_exists 的问题。 I need to check if a product already exists in the shopping cart.
我需要检查购物车中是否已经存在产品。 I'm doing it this way:
我这样做是这样的:
.
$session = $this->request->getSession();
$cart = $session->read( 'cart' );
if (array_key_exists($order->product_id, (array) $cart)) {
$this->Flash->error('Invalid request');
} else {
$cart[] = $order;
$session->write('cart', $cart );
$this->Flash->success($order->product->name_product . ' has been added to the shopping cart');
return $this->redirect( ['action' => 'index'] );
}
return $this->redirect($this->referer());
} else {
return $this->redirect(['action' => 'index']);
}
.
.
I received the error below, but now with the update it no longer exists.我收到了下面的错误,但现在随着更新它不再存在。 But the function still doesn't help me.
但是 function 仍然对我没有帮助。
array_key_exists() expects parameter 2 to be array, int given
The product is added to the cart even if it has already been added.即使产品已添加,该产品也会添加到购物车中。 I need to compare the selected product id with the product id that is already in the cart.
我需要将所选产品 ID 与购物车中已有的产品 ID 进行比较。 The order information is basically: id, quantity, user_id, product_id.
订单信息基本是:id、数量、user_id、product_id。
I am grateful if anyone can analyze some way to check the id in the array that is mounted.如果有人可以分析某种方法来检查已安装数组中的 id,我将不胜感激。
When you do this:当你这样做时:
$cart[] = $order;
you are asking PHP to add a new element to the end of your $cart
array, giving it the next available numeric key.您要求 PHP 在
$cart
数组的末尾添加一个新元素,为其提供下一个可用的数字键。 You are then trying to see if the product id exists as a key in the array.然后,您尝试查看产品 ID 是否作为数组中的键存在。 Unless your product ids are like 0 and 1, that's unlikely to ever happen.
除非您的产品 ID 像 0 和 1,否则这不太可能发生。 If you want your cart to be keyed by product id, use
如果您希望您的购物车按产品 ID 键入,请使用
$cart[$order->product_id] = $order;
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