Set a Google Analytics Custom Dimension using a MonsterInsights PHP Filter

1004596-mi-set-custom-dimension-README.md

Deprecated in MI gtag versions. For gtag, see https://gist.github.com/chavesm/8b719fc32505b26d4dcfa32a0a423617

1004596-mi-set-custom-dimension.php

<?php

/**
 * This example sets custom dimension #9 to be the WordPress
 * post ID of the page/post being visited.
 *
 * - Change the number 9 to your custom dimension index number.
 * - Change the call to get_the_id() to what you need the CD value to be.
 */
add_filter( 
  'monsterinsights_frontend_tracking_options_analytics_before_pageview', 
  function( $options ) {
	  $options[ 'dimension9' ] = "'set', 'dimension9', '" . get_the_id() . "'";
	  return $options;
  }, 
  20 // priority
);

1004596-wp-get-user-id.php

<?php

/**
 * Helper function for retrieving WordPress user metadata 
 * if needed to use as a custom dimension. Remember to 
 * respect PII here. Any Google PII violations can result
 * in account suspensions. E.g., the user role wouldn't 
 * be a PII concern, but the email address would be.
 * 
 * Another use case is to use the user ID to retrieve
 * custom meta such as a membership
 * level.
 */

// Example getter for the WP internal user ID.
function 1004596_get_user_id() {
  $current_user = wp_get_current_user();
  if ( ! ( $current_user instanceof WP_User ) ) {
    return;
  }
  $user_ID = $current_user->ID;
  return $user_ID;
}