PHP添加到购物车会话错误

问题描述：

I'm testing out this simple shopping cart code and for some reason it doesn't seem to work. I've created 3 pages, 1st page contains:

<a href="add-to-cart.php?id=1">Item 1</a><br><br>
<a href="add-to-cart.php?id=2">Item 2</a><br><br>
<a href="add-to-cart.php?id=3">Item 3</a><br><br>

On the 2nd (add-to-cart.php) page:

<?php
session_start();

if(empty($_session['cart'])){
$_session['cart'] = array();
}

array_push($_session['cart'], $_GET['id']);
?>
<br><br>
Product is succesfully added to cart.
<a href="cart.php">View Cart Items</a>

Finally, on the 3rd (cart.php) page:

<?php 
session_start();

var_dump($_session['cart']);
?>

Instead of array, i get this error:

Notice: Undefined variable: _session in C:\xampp\htdocs\projects\add_to_cart\independent\compare.php on line 4

NULL

我正在测试这个简单的购物车代码，由于某种原因它似乎不起作用。我创建了3页，第1页包含： p>

 ＆lt; a href =“add-to-cart.php？id = 1”＆gt; Item 1＆lt; / a＆gt  ;＆lt; br＆gt;＆lt; br＆gt; 
＆lt; a href =“add-to-cart.php？id = 2”＆gt;第2项＆lt; / a＆gt;＆lt; br＆gt;＆lt; br＆gt; 
＆lt; a href =  “add-to-cart.php？id = 3”＆gt;第3项＆lt; / a＆gt;＆lt; br＆gt;＆lt; br＆gt; 
  code>  pre> 
 
 在第2位（  add-to-cart.php）页面： p> 
 
 
 ＆lt;？php 
session_start（）; 
 
if（空（$ _ session ['cart']））{  
 $ _session ['cart'] = array（）; 
} 
 
array_push（$ _ session ['cart']，$ _GET ['id']）; 
？＆gt; 
＆lt; br＆gt;＆lt;  ; br＆gt; 
产品已成功添加到购物车。
＆lt; a href =“cart.php”＆gt;查看购物车商品＆lt; / a＆gt; 
  code>  pre> 
 
 最后， 在3号（cart.php）页面上： p> 
 
 
 ＆lt;？php 
session_start（）; 
 
var_dump（$ _ session ['cart']）; 
？  ＆gt; 
  code>  pre> 
 
 而不是数组，我收到此错误： p> 
 
 
 
 注意：未定义的变量：_session 在第4行的C：\ xampp \ htdocs \ projects \ add_to_cart \ independent \ compare.php  p> 
 
 
 NULL  p> 
  blockquote> 
   DIV>

答

You have to write session in capital letters like:

$_SESSION["cart"]

and not:

$_session["cart"]  //if you write it like this it's a normal array

So your code should look like this:

add-to-cart.php:

<?php
session_start();

if(empty($_SESSION['cart'])){
$_SESSION['cart'] = array();
}

array_push($_SESSION['cart'], $_GET['id']);
?>
<br><br>
Product is succesfully added to cart.
<a href="cart.php">View Cart Items</a>

cart.php:

<?php 

    session_start();
    var_dump($_SESSION['cart']);

?>

For more information see: http://php.net/manual/en/reserved.variables.session.php

答

Use $_SESSION in uppercase. Variable names are case sensitive in PHP.

PHP添加到购物车会话错误

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