gistfile1.txt

/**
 * Retrieve site option value based on name of option.
 *
 * @since 2.8.0
 *
 * @see get_option()
 *
 * @global wpdb $wpdb
 *
 * @param string $option    Name of option to retrieve. Expected to not be SQL-escaped.
 * @param mixed  $default   Optional value to return if option doesn't exist. Default false.
 * @return mixed Value set for the option.
 */
function get_network_option( $option, $default = false, $network_id = false ) {
	global $wpdb;
	
	if( ! $network_id ){
	  $current_network = get_current_site();
	  $network_id = $current_network->id;
	}

	/**
	 * Filter an existing site option before it is retrieved.
	 *
	 * The dynamic portion of the hook name, `$option`, refers to the option name.
	 *
	 * Passing a truthy value to the filter will effectively short-circuit retrieval,
	 * returning the passed value instead.
	 *
	 * @since 2.9.0 As 'pre_site_option_' . $key
	 * @since 3.0.0
	 * @since 4.4.0 The `$option` parameter was added
	 *
	 * @param mixed  $pre_option The default value to return if the option does not exist.
	 * @param string $option     Option name.
	 */
	$pre = apply_filters( 'pre_site_option_' . $option, false, $option );

 	if ( false !== $pre )
 		return $pre;

	// prevent non-existent options from triggering multiple queries
	$notoptions_key = "{$network_id}:notoptions";
	$notoptions = wp_cache_get( $notoptions_key, 'site-options' );

	if ( isset( $notoptions[$option] ) ) {

		/**
		 * Filter a specific default site option.
		 *
		 * The dynamic portion of the hook name, `$option`, refers to the option name.
		 *
		 * @since 3.4.0
		 * @since 4.4.0 The `$option` parameter was added.
		 *
		 * @param mixed  $default The value to return if the site option does not exist
		 *                        in the database.
		 * @param string $option  Option name.
		 */
		return apply_filters( 'default_site_option_' . $option, $default, $option );
	}

	if ( ! is_multisite() ) {

		/** This filter is documented in wp-includes/option.php */
		$default = apply_filters( 'default_site_option_' . $option, $default, $option );
		$value = get_option($option, $default);
	} else {
		  $value = get_network_meta($network_id, $option, true);
			// Has to be get_row instead of get_var because of funkiness with 0, false, null values
			if ( false !== $value ) {
				$value = maybe_unserialize( $value );
			} else {
				if ( ! is_array( $notoptions ) ) {
					 $notoptions = array();
				}
				$notoptions[$option] = true;
				wp_cache_set( $notoptions_key, $notoptions, 'site-options' );

				/** This filter is documented in wp-includes/option.php */
				$value = apply_filters( 'default_site_option_' . $option, $default, $option );
			}
	}

	/**
	 * Filter the value of an existing site option.
	 *
	 * The dynamic portion of the hook name, `$option`, refers to the option name.
	 *
	 * @since 2.9.0 As 'site_option_' . $key
	 * @since 3.0.0
	 * @since 4.4.0 The `$option` parameter was added
	 *
	 * @param mixed  $value  Value of site option.
	 * @param string $option Option name.
	 */
	return apply_filters( 'site_option_' . $option, $value, $option );
}

function add_network_meta( $network_id, $meta_key, $meta_value, $unique = false ) {
  if( ! is_multisite() ){
     return false;
  }

	return add_metadata('site', $post_id, $meta_key, $meta_value, $unique);
}