signup.php

public function signup()
{
    if(!$this->isPost())
        return $this->render("signup");

    try {
        list($uname, $passwd, $email, $contact) = $this->post([
            "uname" => '/^[A-Za-z][A-Za-z0-9_]+$/',
            "passwd",
            "email" => '/^[A-Za-z0-9_\-\.\+]+@[A-Za-z0-9_\-\.]+$/',
            "contact"
        ]);

        if($this->model->byUName($uname)->data())
            throw new lpHandlerException("userExists");

        if(in_array($uname, lpPlugin::hook("pUserCenter.notAllowSignup", [])))
            throw new lpHandlerException("notAllowSignup");

        $this->model->register($uname, $passwd, $email, $contact);

        lpApp::goUrl("/");
    }
    catch(lpHandlerException $e)
    {
        return $this->render("signup", [
            "error" => $e->getMessage()
        ]);
    }
}