A very very simple templating class for php... seriously... probably has too few features.

simplate.php

<?php

class Simplate {

  /*
   * Sets include file name, and sanitizes vars.
   */
  function __contruct($template_name = '404', $vars = array()) {
    // Escapt all values by default.
    $this->template_vars = $this->sanitize_vars($vars);

    // Todo... ensure we don't allow paths here... only filenames.
    $this->template_include = $template_name . '.tpl.php';
  }

  /*
   * Sanitizes vars. Keeps old values and prepends them with unsafe_
   */
  private function sanitize_vars($vars) {
    $tmp = array();
    foreach ($vars as $key => $value) {
      $tmp[$key] = htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
      $tmp["unsafe_" . $key] = $value;
    }
  }

  /*
   * Renders the template to a buffer, and returns the output.
   */
  function render() {
    $vars = $this->template_vars;
    $template = $this->template_include;

    extract($vars);

    // Clean the scope.
    unset($this);
    unset($vars);

    ob_start();
    include($template);
    $page = ob_get_contents();
    ob_end_flush();

    return $page;
  }

}