/**
 * Returns the identifier for the currently rendered CMS page. 
 * If current page is not from CMS, null is returned.
 * @return String | Null
 */
public function getCurrentCmsPage() {
	$dataCurrentPage = $this->getHelper('cms/page')->getPage()->getData();
	if ($dataCurrentPage) {
		$identifierCurrentPage = $dataCurrentPage['identifier'];
		return $identifierCurrentPage;	
	} 
	return;		
}

A function for returning the ID of the current CMS page

Magento: get current CMS page ID

php, magento

PHP