on( 'minify_js' ) && ( ! defined( 'DONOTMINIFYJS' ) || ! DONOTMINIFYJS ) && ! is_rocket_post_excluded_option( 'minify_js' ) ) {
			return $src;
		}

		return get_rocket_browser_cache_busting( $src, $current_filter );
	}
}

if ( ! function_exists( 'get_rocket_browser_cache_busting' ) ) {
	/**
	 * Create a cache busting file with the version in the filename
	 *
	 * @since 2.9
	 * @deprecated 3.1
	 * @author Remy Perona
	 *
	 * @param string $src CSS/JS file URL.
	 * @param string $current_filter Current WordPress filter.
	 * @return string updated CSS/JS file URL
	 */
	function get_rocket_browser_cache_busting( $src, $current_filter = '' ) {
		_deprecated_function( __FUNCTION__, '3.1' );
		global $pagenow;

		if ( defined( 'DONOTROCKETOPTIMIZE' ) && DONOTROCKETOPTIMIZE ) {
			return $src;
		}

		if ( ! get_rocket_option( 'remove_query_strings' ) ) {
			return $src;
		}

		if ( is_user_logged_in() && ! get_rocket_option( 'cache_logged_user', 0 ) ) {
			return $src;
		}

		if ( 'wp-login.php' === $pagenow ) {
			return $src;
		}

		if ( false === strpos( $src, '.css' ) && false === strpos( $src, '.js' ) ) {
			return $src;
		}

		if ( false !== strpos( $src, 'ver=' . $GLOBALS['wp_version'] ) ) {
			$src = rtrim( str_replace( array( 'ver=' . $GLOBALS['wp_version'], '?&', '&&' ), array( '', '?', '&' ), $src ), '?&' );
		}

		/**
		 * Filters files to exclude from cache busting
		 *
		 * @since 2.9.3
		 * @author Remy Perona
		 *
		 * @param array $excluded_files An array of filepath to exclude.
		 */
		$excluded_files = apply_filters( 'rocket_exclude_cache_busting', array() );
		$excluded_files = implode( '|', $excluded_files );

		if ( preg_match( '#^(' . $excluded_files . ')$#', rocket_clean_exclude_file( $src ) ) ) {
			return $src;
		}

		if ( empty( $current_filter ) ) {
			$current_filter = current_filter();
		}

		$full_src = ( substr( $src, 0, 2 ) === '//' ) ? rocket_add_url_protocol( $src ) : $src;

		switch ( $current_filter ) {
			case 'script_loader_src':
				$extension = 'js';
				break;
			case 'style_loader_src':
				$extension = 'css';
				break;
		}

		$hosts         = get_rocket_cnames_host( array( 'all', 'css_and_js', $extension ) );
		$hosts['home'] = rocket_extract_url_component( home_url(), PHP_URL_HOST );
		$hosts_index   = array_flip( $hosts );
		$file          = get_rocket_parse_url( $full_src );

		if ( '' === $file['host'] ) {
			$full_src = home_url() . $src;
		}

		if ( false !== strpos( $full_src, '://' ) && ! isset( $hosts_index[ $file['host'] ] ) ) {
			return $src;
		}

		if ( empty( $file['query'] ) ) {
			return $src;
		}

		$relative_src           = ltrim( $file['path'] . '?' . $file['query'], '/' );
		$abspath_src            = rocket_url_to_path( strtok( $full_src, '?' ), $hosts_index );
		$cache_busting_filename = preg_replace( '/\.(js|css)\?(?:timestamp|ver)=([^&]+)(?:.*)/', '-$2.$1', $relative_src );

		if ( $cache_busting_filename === $relative_src ) {
			return $src;
		}

		/*
		* Filters the cache busting filename
		*
		* @since 2.9
		* @author Remy Perona
		*
		* @param string $filename filename for the cache busting file
		*/
		$cache_busting_filename = apply_filters( 'rocket_cache_busting_filename', $cache_busting_filename );
		$cache_busting_paths    = rocket_get_cache_busting_paths( $cache_busting_filename, $extension );

		if ( file_exists( $cache_busting_paths['filepath'] ) && is_readable( $cache_busting_paths['filepath'] ) ) {
			return $cache_busting_paths['url'];
		}

		if ( rocket_fetch_and_cache_busting( $abspath_src, $cache_busting_paths, $abspath_src, $current_filter ) ) {
			return $cache_busting_paths['url'];
		}

		return $src;
	}
}

if ( ! function_exists( 'rocket_dns_prefetch_buffer' ) ) {
	/**
	 * Inserts html code for domain names to DNS prefetch in the buffer before creating the cache file
	 *
	 * @since 2.0
	 * @deprecated 3.1
	 * @author Jonathan Buttigieg
	 *
	 * @param String $buffer HTML content.
	 * @return String Updated buffer
	 */
	function rocket_dns_prefetch_buffer( $buffer ) {
		_deprecated_function( __FUNCTION__, '3.1' );
		$dns_link_tags = '';
		$domains       = rocket_get_dns_prefetch_domains();

		if ( (bool) $domains ) {
			foreach ( $domains as $domain ) {
				$dns_link_tags .= '<link rel="dns-prefetch" href="' . esc_url( $domain ) . '" />';
			}
		}

		$old_ie_conditional_tag = '';

		/**
		 * Allow to print an empty IE conditional tag to speed up old IE versions to load CSS & JS files
		 *
		 * @since 2.6.5
		 *
		 * @param bool true will print the IE conditional tag
		 */
		if ( apply_filters( 'do_rocket_old_ie_prefetch_conditional_tag', true ) ) {
			$old_ie_conditional_tag = '<!--[if IE]><![endif]-->';
		}

		// Insert all DNS prefecth tags in head.
		$buffer = preg_replace( '/<head(.*)>/', '<head$1>' . $old_ie_conditional_tag . $dns_link_tags, $buffer, 1 );

		return $buffer;
	}
}