Small template engine for PHP

template.php

<?php

class Template {
	private $vars = array();
	private $file = null;

	function __construct ($file = null, $vars = null) {
		$this->file = $file;
		if (!is_null($vars)) {
			$this->vars = $vars;
		}
	}
	function __set ($name, $value) {
		return $this->vars[$name] = $value;
	}
	function __get ($name) {
		return $this->vars[$name];
	}
	function __toString () {
		if (is_null($this->file)) {
			return '';
		}
		extract($this->vars);
		ob_start();
		include($this->file);
		return ob_get_clean();
	}
	function render ($file) {
		$this->file = $file;
		return $this;
	}
}

?>