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我认为这不是一个难题，但我陷入了困境。目前我使用php建立了一个登录和注册（注册）界面。我的想法很直接：index.php显示“登录”和“注册”，如果您在数据库中没有帐户，您将被引导到“注册”页面，填写完所有需要的信息后，我想将用户引导至显示“您已注册为”的页面。问题出在这里，我尝试使用 $_SESSION['username'] 来对应用户是谁。但不幸的是，没有打印出用户名。我在registered.php 中使用了isset() 来检查是否设置了$_SESSION['username']。它表明它没有设置，但它应该在那里！

流程是signup.php -> register.php -> registered.php。我的问题是 $_SESSION['username'] 应该在声明 session_start() 之后在 php 文件中传递。下面是我的代码，有人会指出我哪里出错了。

非常感谢。

注册.php

<?php
session_start(); // attention add session_start() again, am I wrong?
$title = "Sign up";
print_r($_SESSION);
?>

<html>
    <head>
        <title><?= $title ?></title>        
        <!--
        <link href="index.css" type="text/css" rel="stylesheet"></link>
        -->
        <link href="signup.css" type="text/css" rel="stylesheet"></link>

        <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
        <script type="text/javascript" src="index.js"></script>

    </head>

    <body>
        <div id="main-content">

            <form method="post" action="register.php">

                <label><input class="defaultText" title="username" name="username" type="text"></label><br/>
                <label><input class="defaultText" title="email" name="email" type="text"></label><br/>
                <label><input class="defaultText" title="company" name="company" type="text"></label><br/>

                <label class = "password">password:<input name="pass1" type="password" /></label><br/>
                <label class = "password">password (again):<input name="pass2" type="password"/></label><br/>

                <input type="submit" value="Sign up!">
            </form>
            <div style="clear: both;"></div>
        </div>
    </body>
</html>

注册.php

<?php

    if(isset($_REQUEST['username']) && isset($_REQUEST['email']) && isset($_REQUEST['company']) && isset($_REQUEST['pass1']) && isset($_REQUEST['pass2'])){

     $username = $_REQUEST['username']; 
     $email = $_REQUEST['email'];
     $company = $_REQUEST['company'];
     $pass1 = $_REQUEST['pass1'];
     $pass2 = $_REQUEST['pass2'];


     if(strlen($username) <= 0) {      
       die("Username must be greater than 0 characters\n");
     }
     if(strlen($email) <= 0) {
       die("Email must be greater than 0 characters\n");
     } 
     if(strlen($company) <= 0) {
       die("Company name must be greater than 0 characters\n");
     }
     if($pass1 != $pass2 && $pass1 <= 0) {
       die("Passwords are not the same.");
     }

     $hash = hash('sha256', $pass1);


     # connect to world database on local computer                                                                                                
     check(mysql_connect("localhost", "root", "123456"), "connect");

     $connect = mysql_connect("localhost", "root", "123456");
        # in order to insert data into database tables, database is already there built via mySQL command from terminal
        # connect with the database

     check(mysql_select_db("product"), "selecting db"); 

     # mysql_real_escape_string() This function must always (with few exceptions) be used to make data safe before sending a query to MySQL. 
     $username = mysql_real_escape_string($username);
     $email = mysql_real_escape_string($email);
     $company = mysql_real_escape_string($company); 

     # this $query query is to send the "insert values" query into a table
     $query = "INSERT INTO admins ( username, hash, email, company ) VALUES ( '$username', '$hash', '$email', '$company' );";
     $results = mysql_query($query);

     check($results, "adding user"); // if not pass show error message

     header("Location: registered.php");
    }

    function check($result, $message) { 
      if (!$result) {
        die("SQL error in $message: " . mysql_error());
      }

      $_SESSION['username'] = $_REQUEST['username'];
      $_SESSION['email'] = $_REQUEST['email'];
      $_SESSION['company'] = $_REQUEST['company'];     

    }
?>

注册.php

<?php
$title = "Registered!";
?>

<html>

    <head>
        <title><?= $title ?></title>

        <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
        <script type="text/javascript" src="index.js"></script>

    </head>

    <body>

<?php

print_r($_SESSION);
if(isset($_SESSION['username']))
    print "hello";
print $_SESSION['username'];
echo $_SESSION['company'];

?>  
        <div id="main-content">


            <h3>You have registered in administration system as <?= $_SESSION['username'] ?></h3>
            <table border="1">
                <tr>
                <th>Name</th>
                <th>Company</th>
                <th>Email</th>
                </tr>

                <tr>

                    <td><?= $_SESSION['username'] ?></td>
                    <td><?= $_SESSION['email'] ?></td>
                    <td><?= $_SESSION['company'] ?></td>

                </tr>

                <h3>please log in into the administration system</h3>
                <h4><a href = "index.php">Log In</a></h4>

            </table> 

        <div style="clear: both;"></div>        

        </div>
    </body>
</html>
4

1 回答 1

1

您需要session_start();在任何内容之前添加每个页面。

register.php并且registered.php缺少会话启动器，他们都使用$_SESSION

编辑：就像迈克布兰特所说，制作一个启动会话的全局文件，并将其包含在任何内容之前的每个文件中。这样，您可以将所有公共变量和会话放在一个文件中。

于 2012-09-24T16:35:17.643 回答