function register_include( $path ){
		if( ! isset($this->incs[$path]) ){
			$this->incs[$path] = 1;
			return false;
		}
		else {
			$this->incs[$path]++;
			return true;
		}
	}
function register_include( $path ){
		if( ! isset($this->incs[$path]) ){
			$this->incs[$path] = 1;
			return false;
		}
		else {
			$this->incs[$path]++;
			return true;
		}
	}
function register_include ( $ path ) { if ( ! isset ( $ this -> incs [ $ path ] ) ) { $ this -> incs [ $ path ] = 1 ; return false ; } else { $ this -> incs [ $ path ] ++ ; return true ; } }
Register a file path for inclusion
@param string absolute path
@return bool whether file has already been included
Register a file path for inclusion