用户身份验证 PHP mySQL 不起作用

所以我目前正在Xampp中使用php和mysql构建一个用户身份验证系统。

我已经设法让它通过他们的电子邮件地址识别用户是否存在，但其他功能似乎不起作用。例如，检查用户是否已激活其帐户，即使我在数据库中将其活动状态更改为 1，他们也没有返回。或者使用登录功能，即使电子邮件和密码都正确，它也会说它们不正确。

这是我的登录名.php脚本

    <?php
include 'init.php';

function sanitize($data){
    return mysql_real_escape_string($data);
}
//check if user exists
function user_exists($email){
        $email = sanitize($email);
        //$query = mysql_query("SELECT COUNT('ID') FROM 'register' WHERE 'email' = '$email'");
        return (mysql_result(mysql_query("SELECT COUNT(ID) FROM register WHERE email = '$email'"),0) == 1)? true : false;
}
//check if user has activated account
function user_activate($email){
        $email = sanitize($email);
        //$query = mysql_query("SELECT COUNT('ID') FROM 'register' WHERE 'email' = '$email'");
        return (mysql_result(mysql_query("SELECT COUNT(ID) FROM register WHERE email = '$email' AND 'active' =1"),0) == 1)? true : false;
}
function user_id_from_email($email){
    $email = sanitize($email);
    return (mysql_result(mysql_query("SELECT id FROM register WHERE email = '$email'"),0,'id'));
}
function login($email,$password){
    $user_id = user_id_from_email($email);
    $email = sanitize($email);
    $password = md5($password);
    return (mysql_result(mysql_query("SELECT COUNT(id) FROM register WHERE email = '$email' AND 'password' ='$password'"),0) == 1)? $user_id : false;
}

if(empty($_POST)=== false){
    $email = $_POST['email'];   
    $password = $_POST['password'];
}
if(empty($email)|| empty($password) === true){
        $errors[] = "You must enter a username and a password"; 
}
else if(user_exists($email) === false){
    $errors[] = "Email address is not registered";  
}
else if(user_activate($email) === false){
    $errors[] = "You haven't activated your account yet";   
}
else{
    $login = login($email, $password);
    if($login === false){
        $errors[] = "email/password are incorrect";
    } else {
        echo "ok";
    }
}
print_r($errors);

/*$email = $_POST['email'];
$password = $_POST['password'];

if($email&&$password){
    $connect = mysql_connect("localhost","root","") or die ("Couldn't Connect");
    mysql_select_db("users") or die("Couldn't find Database");
}
    else 
        die("Please enter a username and a password");
$query = mysql_query("SELECT * FROM register WHERE email = '$email'");
$numrows = mysql_num_rows($query);
echo $numrows;*/

?>

我的数据库被称为'users'，目前只有 1 个名为 'register' 的表。行：id, firstname, lastname, email, password, and active .