main_template_vars handler 加载顺序

/**
 * Common Template main_template_vars handler
 *
 * Normally a page will automatically load its own template based on the page name.<br />
 * so that a page called some_page will load tpl_some_page_default.php from the template directory.<br />
 * <br />
 * However sometimes a page may need to choose the template it displays based on a set of criteria.<br />
 * Placing a file in the includes/modules/pages/some_page/ directory called main_template_vars.php<br />
 * allows you to override this page and choose the template that loads.<br />
 *