Custom cancellation for use sabbella

pmpro_after_change_membership_level_structure.php

<?php
/**
 * Custom downgrade on membership cancellation code for sabbella ticket.
 */
function sabbella_pmpro_after_change_membership_level_downgrades( $level_id, $user_id ) {
    // if we see this global set, then another gist is planning to give the user their level back
    global $pmpro_next_payment_timestamp;
    
    if ( ! empty( $pmpro_next_payment_timestamp ) ) {
        return;
    }
	
    // Are they cancelling?
	if ( $level_id == 0 ) {
		// Check if they are cancelling level 4, 3, or 2.
		global $wpdb;
		$last_level_id = $wpdb->get_var( "SELECT membership_id FROM $wpdb->pmpro_memberships_users WHERE user_id = '" . $user_id . "' ORDER BY id DESC" );
		
        if ( $last_level_id == 4 ) {
			pmpro_changeMembershipLevel( 2, $user_id );
		} elseif( $last_level_id == 3 ) {
			pmpro_changeMembershipLevel( 2, $user_id );
		} else {
			pmpro_changeMembershipLevel( 1, $user_id );
		}
	}
}
add_action( 'pmpro_after_change_membership_level', 'sabbella_pmpro_after_change_membership_level_downgrades', 10, 2 );