<?php

class HtmlTemplate {

    // any parent class methods

}

class Template1 extends HtmlTemplate {

    protected $_html;

    public function __construct() {

        $this->_html = "<p>__text__</p>";

    }

    public function set($html) {

        $this->_html = $html;

    }

    public function render() {

        echo $this->_html;

    }

}

class Template2 extends HtmlTemplate {

    protected $_element;

    public function __construct($s) {

        $this->_element = $s;

        $this->set("<h2>" . $this->_html . "</h2>");

    }

    public function __call($name, $args) {

        $this->_element->$name($args[0]);

    }

}

class Template3 extends HtmlTemplate {

    protected $_element;

    public function __construct($s) {

        $this->_element = $s;

        $this->set("<u>" . $this->_html . "</u>");

    }

    public function __call($name, $args) {

        $this->_element->$name($args[0]);

    }

}