我是 php 和 mysql 的新手。以下代码来自登录页面。我正在尝试在名为 users 的 mysql 数据库中使用 boolean(tinyint) 值。如果“付费”字段的值为 0，我想将用户发送到我的 pay.php 页面，如果值为 1 并且登录详细信息正确，我想将用户发送到 index.php。然而，无论数据库中的值是 0 还是 1，代码都会将用户发送到 pay.php。任何帮助将不胜感激！
$query = mysql_query("SELECT * FROM `users` WHERE username = '$username' AND password = '$password'") or die (mysql_error()); // mySQL query
$r = mysql_num_rows($q); // Checks to see if anything is in the db.
$row = mysql_fetch_array($query);
if($row['paid'] == 0);{ //NOT WORKING!!!
header ("location:pay.php");// go to pay.php
exit( );// Stops the rest of the script.
}
if ($r == 1) { // There is something in the db. The username/password match up.
$_SESSION['logged'] = 1; // Sets the session.
header ("location:index.php");// go to index.php
}
else { // Invalid username/password.
exit("Incorrect username/password!"); // Stops the script with an error message.
}