// Get a list of default status options for a custom field $statusOptions = CRM_Core_PseudoConstant::get('CRM_Activity_BAO_Activity', 'status_id'); foreach ($statusOptions as $statusId => $statusLabel) { // Do something with each option } // Get a list of relationship types $relationshipTypes = CRM_Core_PseudoConstant::get('CRM_Contact_BAO_Relationship', 'relationship_type_id'); foreach ($relationshipTypes as $typeId => $typeName) { // Do something with each relationship type } // Get a list of membership types $membershipTypes = CRM_Core_PseudoConstant::get('CRM_Member_BAO_MembershipType', 'membership_type_id'); foreach ($membershipTypes as $typeId => $typeName) { // Do something with each membership type }In these examples, the CRM_Core_PseudoConstant tag is being used to retrieve lists of options for custom fields, relationship types, and membership types. These lists can then be used in various ways, such as populating dropdown menus or validating user input. The CRM_Core_PseudoConstant tag is part of the CiviCRM package library, which is a set of PHP classes and functions for building and managing constituent relationship management (CRM) systems.