Source Reference:

• Component: bbPress :: bbp-user

  File: /bbp-includes/bbp-user-template.php :: Trac Source Line: 105

  	 * Return ID of displayed user
  	 *
  	 * @since bbPress (r2688)
  	 *
  	 * @uses bbp_get_user_id() To get the displayed user id
  	 * @uses apply_filters() Calls 'bbp_get_displayed_user_id' with the id
  	 * @return int Displayed user id
  	 */
  	function bbp_get_displayed_user_id() {
  		return apply_filters( 'bbp_get_displayed_user_id', bbp_get_user_id( 0, true, false ) );
  	}
  
  /**
   * Return a sanitized user field value
   *
   * @since bbPress (r2688)
   *
   * @param string $field Field to get
   * @uses sanitize_text_field() To sanitize the field
   * @uses esc_attr() To sanitize the field