獲取從$ _SESSION

Question

我試圖創建簡單的服務器端驗證數據，這是我的方法

public function create() { 
     $name = $_POST['name']; 

     session_start(); 
     unset($_SESSION['errors']); 

     $count = $this->model->checkIfUserExists($name); 
     if($count > 0) {  
      $_SESSION['errors'] = array(
       'message' => 'User Already Exists', 
       'variables' => array(
        'name'  => $_POST['name'], 
        'password' => $_POST['password'], 
       ), 
      ); 

      header('location: ' . URL . 'user/registration'); 
      exit; 
     }   

     $data = array(); 
     $data['name'] = $_POST['name']; 
     $data['password'] = $_POST['password']; 
     $this->model->create($data);    
     header('location: ' . URL); 
    } 

和下面的代碼從registration.php的

<?php 

if (isset($_SESSION['errors']) && count($_SESSION['errors']) > 0) { 

echo '<ul>'; 
foreach ($_SESSION['errors'] as $error) { 
    echo '<li>' . $error['message'] . '</li>'; 
} 
echo '</ul>'; 
unset($_SESSION['errors']); 
} 
?> 

但我得到的錯誤

Warning: Illegal string offset 'message' in C:\xampp\htdocs\test\views\user\registration.php on line 6 
� 

Notice: Undefined index: message in C:\xampp\htdocs\test\views\user\registration.php on line 6 

如何解決？

Answer 1

通常，Warning: Illegal string offset ...意味着您正在嘗試以字符串的形式訪問字符串。

目前，您正在將$_SESSION['errors']設置爲具有兩個元素message和variables的關聯數組。我相信你試圖實現的是創建一個有多個錯誤的陣列，每個錯誤有一個message和variables。

設置像這樣應該做的：

... 

$_SESSION['errors'] = array(); 

if ($count > 0) { 
    $_SESSION['errors'][] = array(
     'message' = > 'User Already Exists', 
     'variables' = > array(
      'name' = > $_POST['name'], 
      'password' = > $_POST['password'], 
     ), 
    ); 

    header('location: '.URL.'user/registration'); 
    exit; 
} 

... 

空方括號中添加新元素添加到數組：

$myArray[] = $myNewElement; 

這樣你就可以很容易地添加到列表中的其他錯誤 ：

$_SESSION['errors'][] = array(
    'message' = > 'Error two', 
    'variables' = > array(...), 
); 
$_SESSION['errors'][] = array(
    'message' = > 'Error three', 
    'variables' = > array(...), 
); 

Answer 2

這是因爲每個都穿過主陣列中的項目。 [ 「消息」， 「變量」]

分配$_SESSION['errors'] =這樣的：$_SESSION['errors'][] =

$_SESSION['errors'][] = array(
        'message' => 'User Already Exists', 
        'variables' => array(
         'name'  => $_POST['name'], 
         'password' => $_POST['password'], 
        ), 
       ); 

Answer 3

registration.php的在第一次啓動會議session_start()

<?php 
session_start(); 
if (isset($_SESSION['errors']) && count($_SESSION['errors']) > 0) { 

echo '<ul>'; 
foreach ($_SESSION['errors'] as $error) { 
    echo '<li>' . $error['message'] . '</li>'; 
} 
echo '</ul>'; 
unset($_SESSION['errors']); 
} 
?>