PHP：帮助根据数据库中的url重定向重定向用户

Question

我一直在试图建立一个用户登录页面，当用户登录时，会根据用户id将用户重定向到特定的url。

更具体地讲，我们在数据库中说，我有4行：ID，用户名，密码，重定向。成功登录后，它将转到用户的特定行，获取重定向网址，并将用户重定向到该网址。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。这里是代码：

<?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"; 
} 
?> 

我真的很感谢任何帮助，教程或批评。谢谢。 （请同时是描述在你的答案，我还是很新的Web开发;））

Answer 1

既然你只能重定向一个人一个时间，你已经从原来的选择查询的redirect值，对于一个用户名和密码匹配检查，我会更改您的代码是这样的：

$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(); 

我将在一个行启动。此查询说明了成员表中所有行的重定向。之后，运行一个循环，您将尝试重定向到每个值。