PHP：幫助根據數據庫中的url重定向重定向用戶

Question

我一直在試圖建立一個用戶登錄頁面，當用戶登錄時，會根據用戶id將用戶重定向到特定的url。

更具體地講，我們在數據庫中說，我有4行：ID，用戶名，密碼，重定向。成功登錄後，它將轉到用戶的特定行，獲取重定向網址，並將用戶重定向到該網址。我已經創建了一個腳本，它將根據數據庫的重定向url重定向url，但是當我向db添加更多用戶時，它會凍結，並且通常不會顯示任何內容或重定向到錯誤的url。這裏是代碼：

<?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"; 
} 
?> 

我真的很感謝任何幫助，教程或批評。謝謝。 （請同時是描述在你的答案，我還是很新的Web開發;））

Answer 1

既然你只能重定向一個人一個時間，你已經從原來的選擇查詢的redirect值，對於一個用戶名和密碼匹配檢查，我會更改您的代碼是這樣的：

$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(); 

我將在一個行啓動。此查詢說明了成員表中所有行的重定向。之後，運行一個循環，您將嘗試重定向到每個值。