Question

I have a function that insert new users to a database. If the input is somewhat bad or the username or email already excist i want it to return false.

This is what it looks like:

public function input( $username, $password, $email ){
    if( $stmt = $this->mysqli->prepare("INSERT INTO users (username, password, email) VALUES (?, ?, ?)" )){

        $stmt->bind_param('sss', $username, $password, $email);
        $stmt->execute();
        $stmt->close();
        $this->mysqli->close();

        return true;
    }
    else{
        return false;
    }
}

It works perfectly fine until I try to create a duplicate, it returns true, but doesnt affect the tabledata in the database as I can see.

Answer 1

return !!$this->mysqli->insert_id; // instead of true