CComponentUtil::isComponent

static function isComponent($componentPath)
{
	$bDirectoryExists = file_exists($_SERVER["DOCUMENT_ROOT"].$componentPath)
		&& is_dir($_SERVER["DOCUMENT_ROOT"].$componentPath);
	if(!$bDirectoryExists)
		return false;

	$bComponentExists = file_exists($_SERVER["DOCUMENT_ROOT"].$componentPath."/component.php")
		&& is_file($_SERVER["DOCUMENT_ROOT"].$componentPath."/component.php");
	if($bComponentExists)
		return true;

	$bClassExists = file_exists($_SERVER["DOCUMENT_ROOT"].$componentPath."/class.php")
		&& is_file($_SERVER["DOCUMENT_ROOT"].$componentPath."/class.php");
	if($bClassExists)
		return true;

	return false;
}