Article: Method Chaining in PHP

Email.php

<?php

class Email extends BaseEmail {

    protected $to = '';
    protected $subject = ''
    protected $message = '';

    public function to($email)
    {
        $this->to = $email;

        return $this;
    }

    public function subject($subject)
    {
        $this->subject = $subject;

        return $this;
    }

    public function message($message)
    {
        $this->message = $message;

        return $this;
    }

    public function send()
    {
        return mail($this->to, $this->subject, $this->message);
    }
}