如果使用时未输入正确的登录名组合，我将尝试在最后显示错误。但是，当我输入错误的密码或电子邮件时，不会显示错误消息。有什么建议么
<?php
include ("connect.php");
if (isset($_POST["user_login"]) && (isset($_POST["user_pass"]))){
// formatting field via reg replace to ensure email and password only conisists of letters and numbers preg_replace('#[^A-Za-z0-9]#i','',
$login_user = $_POST["user_login"];
$login_password = $_POST["user_pass"];
// password is encryted in DB (MD5) therefore user inputted password will not match encryted password in DB - we have to assign new var
$decrypted_password = md5($login_password);
// Query which finds user (if valid) from DB - Achieving authentication via username and password
$user_query = mysqli_query($connect, "SELECT * FROM users WHERE email = '$login_user' AND password = '$decrypted_password' AND closed = 'no' LIMIT 1");
$check_user = mysqli_num_rows($user_query); // checking to see if there is infact a user which those credentials in the DB
if ($check_user==1){
while ($row = mysqli_fetch_array($user_query)){
$id = $row['user_id'];
$user_type = $row['account'];
}
$_SESSION["user_login"] = $login_user;
// check the user type and redirect according to it
if($user_type == "Student"){
$student_page = "profile_student.php";
header( "Location:{$student_page}" );
} elseif ($user_type == "Landlord"){
$landlord_page = "landlord_profile.php";
header( "Location:{$landlord_page}" );
} elseif ($user_type == "Administrator"){
$admin_page = "admin_profile.php";
header( "Location:{$admin_page}" );
}else {
$refresh_page = "sign_up.php";
header( "Location:{$refresh_page}" ); // refresh page
echo "You have entered an incorrect email or password. Please try again.";
}
}
}
?>
如果输入数据错误，您将重定向用户，只有在此之后，您才尝试回显消息，这不是工作原理。在php_manual中阅读有关标头的信息。可能最好的方法是在会话中存储错误消息，并在重定向后检查会话错误消息是否存在
else {
$refresh_page = "sign_up.php";
$_SESSION['error'] = "your error message"
header( "Location:{$refresh_page}" ); // refresh page
}
在sign_up.php文件中，检查会话中是否存在错误消息
if(isset($_SESSION["error"])){
echo $_SESSION["error"];
unset($_SESSION["error"]);
}
也许您应该稍微纠正一下此代码））在显示应将其从会话中删除的消息后，使用unset cause'；否则，例如，如果您失败了5次，它将显示5条消息））也请确保该会话开始session_start()希望对您有所帮助：）
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