它為我的一個 php 腳本顯示一個空白頁面

Question

我試圖讓用戶保持登錄狀態，直到他們單擊注銷鏈接或關閉瀏覽器。

我遇到的問題是，對於teacherlogin.php 頁面，它只是顯示一個空白頁面。 沒有 php 錯誤或 javascript 錯誤，所以我的問題是我在下面的teacherlogin.php 代碼中做錯了什么；

教師登錄.php

        <?php
/*
file: login.php
authorized (logged in) users must be redirected to a secure page (member.php) or (secure.php)
unauthorized (guests) users have to see the login form
*/

#include the class file and start it.

ini_set('display_errors', TRUE);
error_reporting(E_ALL);

require_once('session.class.php');
$session = new Session();

#check user's access
if($session->get("auth"))header("location:members.php");
?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
        <title>Teacher Login</title>
   <link rel="stylesheet" type="text/css" href="TeacherLoginStyle.css">
   </head>
<?php

// connect to the database
include('connect.php');
/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    die();
}

// required variables (make them explciit no need for foreach loop)
if (isset($_POST['submit'])) {
    $teacherusername = (isset($_POST['teacherusername'])) ? $_POST['teacherusername'] : '';
    $teacherpassword = md5(md5("g3f".$_POST['teacherpassword']."rt4"));  

    // don't use $mysqli->prepare here
    $query = "SELECT TeacherId, TeacherForename, TeacherSurname, TeacherUsername, TeacherPassword, Active FROM Teacher WHERE TeacherUsername = ? AND TeacherPassword = ? LIMIT 1";
    // prepare query
    $stmt=$mysqli->prepare($query);
    // You only need to call bind_param once
    $stmt->bind_param("ss",$teacherusername,$teacherpassword);
    // execute query
    $stmt->execute(); 
    // get result and assign variables (prefix with db)
    $stmt->bind_result($dbTeacherId, $dbTeacherForename,$dbTeacherSurname,$dbTeacherUsername,$dbTeacherPassword, $dbActive);

    while($stmt->fetch()) {
        if ($teacherusername == $dbTeacherUsername && $teacherpassword == $dbTeacherPassword) {
            if ($dbActive == 0) {
                $error = "You Must Activate Your Account from Email to Login";
            }else{
                $session->set('auth',TRUE);
                $session->set('active',TRUE);
                $session->set('teacherid',$dbTeacherId);
                $session->set('teacherusername',$dbTeacherUsername);
                header('Location: members.php') ;
            }
        }else{
            //password and username dont match
                $error = "The Username or Password that you Entered is not Valid. Try Entering it Again";
        }
    }

    /* close statement */
    $stmt->close();

    /* close connection */
    $mysqli->close();
}

include('noscript.php');

?>

<body>

    <h1>TEACHER LOGIN</h1>

  <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post" id="teachLoginForm">        
  <p>Username</p><p><input type="text" name="teacherusername" /></p>      <!-- Enter Teacher Username-->
  <p>Password</p><p><input type="password" name="teacherpassword" /></p>  <!-- Enter Teacher Password--> 
  <p><input id="loginSubmit" type="submit" value="Login" name="submit" /></p>
  </form>

  <a href="./forgotpass.php">Forgot Password</a>


</body>

</html>

會話.class.php

<?php
/*
Simple PHP Session Class:
    a simple class to help managing the Session function in
    php for beginners and it introduces them to OOP where
    they can modify it and add new features and extend its
    functionality (session in database, track users actions,etc)
*/
#Session settings.

#Session cookie lifetime at the user browser. (seconds)
ini_set('session.cookie_lifetime', '0');

#Read the functions reference below before you change these values.
ini_set('session.gc_maxlifetime',7200);# 2 hours.
ini_set('session.gc_probability', '1'); #default PHP value.
ini_set('session.gc_divisor', '100'); #default PHP value.

/*====================================================================

ini_set('session.cookie_lifetime', '0');

    User cookie life time in seconds.
    0 means the cookie wont expire until the user closes the broswer


ini_set('session.gc_maxlifetime',7200); #default: 1440 (24 mins).

    Session Garbage Collection cleaner (GC). 

    7200(seconds) equals to (2 hours): The GC will try to
    clean session data in the server for (users who logged
    out, closed the browser AND users who are inactive for
    more than that time) however the clean function does
    not run directly, read the next block for more explaination.

    PHP manual:
        session.gc_maxlifetime specifies the number of
        seconds after which data will be seen as 'garbage'
        and potentially cleaned up. Garbage collection may
        occur during session start
        (depending on session.gc_probability and session.gc_divisor).


ini_set('session.gc_probability', '1'); #default PHP value (1).
ini_set('session.gc_divisor', '100'); #default PHP value (100).

    Garbage Collection (GC) Settings:
    PHP manual:
        session.gc_divisor coupled with
        session.gc_probability defines the probability
        that the gc (garbage collection) process is started
        on every session initialization. The probability is
        calculated by using gc_probability/gc_divisor
        e.g. 1/100 means there is a 1% chance that the GC
        process starts on each request.
        session.gc_divisor defaults to 100.  
====================================================================*/

/*
    HOW TO USE:
    - include the session file in all your files and call the session object
    require_once('session.class.php');
    $session = new Session();


    GET SESSION ID:
    - $session->sid;
      @return type (string)
      @example:
      echo $session->sid;

    GENEREATE NEW SESSION ID:
    - $session->re();
      @return type (string)
      #note: returns the value of the new session id.
      @example:
      $sid = $session->sid;
      $new_sid = $session->re();
      echo "My Session ID is: {$sid} but I got a new one now: {$new_sid};

    ASSIGN NEW SESSION VALUE:
    - $session->set($key,$value);
      @return type (void)
      @examples:
        $session->set("name","foo bar");
        $session->set("age",24);
        $session->set("auth",TRUE);

    GET SESSION VALUE:
    - $session->get($key);
      @return type (boolean, int, string, array).
      #note: returns FALSE if the value is not set
      @examples:
      echo $session->get("name");
      if($session->get("auth")) echo "hello authorized user!";

      if(($age = $session->get("age")) > 21)
      echo "your age is {$age}, you can drive!";

    DELETE SESSION VALUE:
    - $session->delete($key);
      @return type (void);
      @example
      $session->delete("age");

    DESTROY SESSION
    - $session->destroy();
      @return type (void);
*/
/*==================================================================*/
class Session{
    public $sid;
    public function __construct() {
        @session_start();
        $this->sid = session_id();
    }
    public function re(){
        @session_regenerate_id();
        $this->sid = session_id();
        return $this->sid;
    }
    public function set($key, $val) {
        $_SESSION[$key] = $val;
        return true;
    }

    public function get($key) {
        if ( isset($_SESSION[$key]) ) {
            return $_SESSION[$key];
        }

        return false;
    }

    public function delete($key) {
        unset($_SESSION[$key]);
    }

    public function destroy() {
        $_SESSION = array();
        session_destroy();
    }
}            
?>

會員.php

<?php
    ini_set('display_errors',1); 
    error_reporting(E_ALL);

    /*
    file: secure.php, profile.php, member.php
    authorized (logged in) users => log them out and show goodbye msg or send them to login.php
    unauthorized (guests) users => redirect them to login.php
    */
    require_once('session.class.php');
    $session = new Session();

    #if user is not logged in, he will be sent to the login.php page
    #note the (!) sign before the $session, it means if the $session->get("auth") == false
    if(!$session->get("auth")) header("location:teacherlogin.php");

    echo "hello, you are logged in";
    echo "<br />";
    echo "username: ".$session->get("teacherusername");
    echo "<br />";
    echo "teacherid: ".$session->get("teacherid");
    echo "<br />";
    echo "active status: ".$session->get("active") ? "Active" : "Not Active";
    echo "<br />";
    echo "<a href='logout.php'>Log out</a>";

?>

Answer 1

把它放在你腳本的最頂部......

error_reporting(E_ALL);

ini_set('display_errors', '1');

這應該強制錯誤顯示在屏幕上。 如果沒有，請檢查您的 Web 服務器日志以了解有關加載此頁面時您的服務器給出的響應的詳細信息。 您將能夠在那里看到錯誤信息。

它為我的一個 php 腳本顯示一個空白頁面

問題描述

1 個解決方案

解決方案1
1 已采納 2012-11-13 01:42:29

它為我的一個 php 腳本顯示一個空白頁面

問題描述

1 個解決方案

解決方案1 1 已采納 2012-11-13 01:42:29

解決方案1
1 已采納 2012-11-13 01:42:29