PHP會話和表單輸入名字感到困惑

Question

我看到一些奇怪的行爲：

我有2個會議，我設置了一些值：$_SESSION['shippingZip']和$_SESSION['shippingOption']。

然後我的代碼都會經歷這個代碼張貼在形式發送的輸入值：

$shippingOption = $_POST['shippingOption']; 
Print_r ($_SESSION); 
$shippingZip = $_POST['shippingZip']; 

這些帖子來了空在這一關。但是，打印會顯示我的會話$ _SESSION ['shippingOption']爲空，當它顯示之前分配給它的字符串時。 -------------------------- POSTING充分證明 會話裝載有一些數據：

$_SESSION['shippingOption'] = $shippingOption; 
$_SESSION['shippingZip']= $shippingZip; 

然後：

Print_r ($_SESSION); 
$shippingOption = $_POST['shippingOption']; 
Print_r ($_SESSION); 
$shippingZip = $_POST['shippingZip']; 
Print_r ($_SESSION); 

輸出：

Array ([itemAdded] => 1 [Payment_Amount] => 46.52 [cart] => Array ([4] => Array ([itemId] => 4 [qty] => 1)) [shippingOption] => FIRST CLASS [shippingZip] => 10025 [shippingPrice] => 1.52) 
Array ([itemAdded] => 1 [Payment_Amount] => 46.52 [cart] => Array ([4] => Array ([itemId] => 4 [qty] => 1)) [shippingOption] => [shippingZip] => 10025 [shippingPrice] => 1.52) 
Array ([itemAdded] => 1 [Payment_Amount] => 46.52 [cart] => Array ([4] => Array ([itemId] => 4 [qty] => 1)) [shippingOption] => [shippingZip] => [shippingPrice] => 1.52 

你可以清楚地看到每個職位後，具有相同名稱的會議失去了它的價值。這完全瘋了！

Answer 1

$_POST不直接填充$_SESSION。您需要將值分配給會話

即

$_SESSION['shippingOption'] = $_POST['shippingOption']; 

編輯

後您發佈更多的代碼，它看起來像你不設置它之前定義$shippingOption;$_SESSION['shippingOption'] = $shippingOption;

確保訂單如下：

$shippingOption = $_POST['shippingOption']; 
$_SESSION['shippingOption'] = $shippingOption;