PHP：如果用户存在，则PDO检查不起作用

Question

I'm new to PHP, I created User class/object which has a function that checks for user, it returns $stmt->rowCount() but when I check for it in code it just skip it, register the user..

Here is the code:

if(empty($name_err) && empty($email_err) && empty($username_err) && empty($password_err) && empty($confirm_password_err)) {   
            if($user->doesUserExist($email) === 0) {
                    $password = password_hash($password, PASSWORD_DEFAULT);
                    $user->register($username, $name, $email, $password); 
                } else {
                    $global_err = "Email is already taken";
                }
         }

Here is the function from User class:

public function doesUserExist($email) {
            $query = "SELECT * FROM users WHERE email = :email";
            $stmt = $this->connection->prepare($query);
            $stmt->bindParam(':email', $email);
            $stmt->execute();
            $rowcount = $stmt->rowCount($stmt);
            return $rowcount;

        }

Answer 1

instead of === in your condition of if($user->doesUserExist($email) === 0) try to change to == and then try to change your method like this:

public function doesUserExist($email) {
            $query = "SELECT * FROM users WHERE email = '" . $email . "';";
            $stmt = $this->connection->prepare($query);
            $stmt->execute();
            $stmt->setFetchMode(PDO::FETCH_ASSOC);
            $rowcount = count($stmt->fetchAll());
            return $rowcount;

 }

Answer 2

You should Try

Call the function

$checkemail=$api->checkuseremail($email);
if($checkemail)
{
    echo $mail_check;
}

and define your function like this

public function checkuseremail($email)
{
    $db=getDB();
    $stmt = $db->prepare("Select id from table_name where email=:email");
    $stmt->bindParam("email", $email, PDO::PARAM_STR);
    $stmt->execute();
    $count = $stmt->rowCount();
    if($count)
    {
        return true;
    }
    else
    {
        return false;
    }
}

It will return email are already exist or not