php - 无法在 PHP 中显示 session 消息？

Question

我在我的类文件中设置 session 消息 $_SESSION['op_status'] = 'MY MESSAGE HERE'; 然后重定向页面 header("location:news.php") ; 页面重定向到 news.php 但 session 消息未显示。

配置.php:

<?php
   session_start();
   // DATABASE CONFIURATION GOES HERE
?>

新闻.php:

<?php
  require_once 'config.php';
  require_once 'classes/class.news.php';
  $objNews = new News();

  if(isset($_POST['submit']) && $_POST['submit'] == 'add')
   $objNews->add();

?>

<span class='text-warning'><?php echo $_session['op_status']; ?></span>

class.news.php:

public function add() {
  if(){
     // SOME CODE GOES HERE
  } else {
     $_SESSION['op_status'] == 'Already Exist';
  }
}

Answer 1

您需要在 header() 之后使用 exit()。

 $_SESSION['msg']="Hello";
 header("Location: account.php");
 exit();

然后在account.php中使用

 echo $_SESSION['msg'];

确保 session_start(); 在您要显示/创建 session 消息的每个页面上。

与其使用这种方式，我更喜欢使用下面的函数。 (在 Bootstrap HTML 标记中区分它是错误消息还是成功)

 function _redirect($url=NULL, $message=NULL, $message_type=NULL){
      $_SESSION['sess_flash_message']= array();
      if($message){
          switch($message_type){ 
            case 'success': $_SESSION['sess_flash_message'][] = '<div class="alert alert-success"><button data-dismiss="alert" class="close" type="button">×</button>'.$message.'</div>';break;
            case 'error': $_SESSION['sess_flash_message'][] = '<div class="alert alert-error"><button data-dismiss="alert" class="close" type="button">×</button>'.$message.'</div>';break;
            case 'notice': $_SESSION['sess_flash_message'][] = '<div class="alert alert-info"><button data-dismiss="alert" class="close" type="button">×</button>'.$message.'</div>';break;
            case 'warning': $_SESSION['sess_flash_message'][] = '<div class="alert alert-block"><button data-dismiss="alert" class="close" type="button">×</button>'.$message.'</div>';break;
            default: $_SESSION['sess_flash_message'][] = $message;
          }
      }
    if($url) {
        header("Location: ".$url);
    } else {
        header("Location: ".$_SERVER['HTTP_REFERER']);
    }
     exit();
     ob_flush();    
}

并调用_redirect('login.php','你需要先登录!','warning');