Question

我一直在尝试创建一个用户登录页面，当用户登录时，会根据用户ID将用户重定向到特定网址。

更具体地说，我想在数据库中我有4行： id ，用户名，密码，重定向< / strong>即可。成功登录后，它将转到用户的特定行，获取重定向URL，并将用户重定向到该URL。我已经创建了一个脚本，它将根据数据库的重定向url重定向url，但是当我向db添加更多用户时，它会冻结并且通常不会显示任何内容或重定向到错误的url。这是代码：

<?php $host="localhost"; // Host name $username="root"; // Mysql username $password=""; // Mysql password $db_name="test"; // Database name $tbl_name="members"; // Table name // Connect to server and select databse. mysql_connect("$host", "$username", "$password")or die("cannot connect"); mysql_select_db("$db_name")or die("cannot select DB"); // username and password sent from form $myusername=$_POST['myusername']; $mypassword=$_POST['mypassword']; // To protect MySQL injection (more detail about MySQL injection) $myusername = stripslashes($myusername); $mypassword = stripslashes($mypassword); $myusername = mysql_real_escape_string($myusername); $mypassword = mysql_real_escape_string($mypassword); $sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'"; $result=mysql_query($sql); // Mysql_num_row is counting table row $count=mysql_num_rows($result); // If result matched $myusername and $mypassword, table row must be 1 row if($count==1){ // Register $myusername, $mypassword and redirect to file"login_success.php" $_SESSION['username'] = $myusername; $_SESSION['password'] = $mypassword; $result = mysql_query("SELECT redirect FROM members"); while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { header("Location: " . $row['redirect']); } exit(); } else { echo "Wrong Username or Password"; } ?>

我非常感谢任何帮助，教程或批评。谢谢。（请在您的答案中描述我对Web开发还很陌生。;））

Answer 1

由于您只能重定向一次，并且您已经检查了用户名和密码匹配的原始选择查询中的redirect值，我会将您的代码更改为以下内容：

$sql = "SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'"; 
$result = mysql_query($sql); 

// Mysql_num_row is counting table row 
$count = mysql_num_rows($result); 

// If result matched $myusername and $mypassword, table row must be 1 row 
if($count == 1){ 
    // Register $myusername, $mypassword and redirect to file"login_success.php" 
    $_SESSION['username'] = $myusername; 
    $_SESSION['password'] = $mypassword; 

    $result = mysql_fetch_array($result); // get the result set from the query

    $redirect = trim($result['redirect']); // get the redirect column's value

    if ($redirect == '') {
        echo "No redirect value was set!";
    } else {
        header('Location: ' . $redirect);
        exit;
    }
} else { 
    echo "Wrong Username or Password"; 
}

Answer 2

$result = mysql_query("SELECT redirect FROM members"); 

while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { 
   header("Location: " . $row['redirect']); 
} 
exit();

我会从第一行开始。此查询说明成员表中所有行的拉重定向。之后，您将进入一个循环，您尝试重定向到每个值。

PHP：根据数据库中的url重定向帮助重定向用户

2 个答案: