bp_activity_remove_user_favorite_meta( $user_id )

function bp_activity_remove_user_favorite_meta( $user_id = 0 ) {

	if ( empty( $user_id ) ) {
		return false;
	}

	/**
	 * For delete user id from other liked activity
	 */
	$activity_ids = bp_get_user_meta( $user_id, 'bp_favorite_activities', true );

	// Loop through activity ids and attempt to delete favorite.
	if ( ! empty( $activity_ids ) && is_array( $activity_ids ) && count( $activity_ids ) > 0 ) {
		foreach ( $activity_ids as $activity_id ) {
			$activity = new BP_Activity_Activity( $activity_id );
			// Attempt to delete meta value.
			if ( ! empty( $activity->id ) ) {

				// Update the users who have favorited this activity.
				$users = bp_activity_get_meta( $activity_id, 'bp_favorite_users', true );
				if ( empty( $users ) || ! is_array( $users ) ) {
					$users = array();
				}

				$found_user = array_search( $user_id, $users );
				if ( ! empty( $found_user ) ) {
					unset( $users[ $found_user ] );
				}

				// Update activity meta
				bp_activity_update_meta( $activity_id, 'bp_favorite_users', array_unique( array_values( $users ) ) );

				// Update the total number of users who have favorited this activity.
				$fav_count = bp_activity_get_meta( $activity_id, 'favorite_count' );

				if ( ! empty( $fav_count ) ) {
					bp_activity_update_meta( $activity_id, 'favorite_count', (int) $fav_count - 1 );
				}
			}
		}
	}

	return true;
}