private function get_merged_string( $string ) {

		// Only merge if there are codes in the string.
		if ( false !== strpos( $string, '{{' ) ) {

			$merge_code_defaults = $this->get_merge_code_defaults();

			foreach ( $this->get_used_merge_codes( $string ) as $code ) {

				// Set defaults.
				if ( array_key_exists( $code, $merge_code_defaults ) ) {

					$func = 'set_merge_data_default';

					// Set customs with extended class func.
				} else {

					$func = 'set_merge_data';

				}

				$string = str_replace( $code, $this->$func( $code ), $string );

			}
		}

		return apply_filters( $this->get_filter( 'get_merged_string' ), $this->sentence_case( $string ), $this );

	}