Don't Send the Membership Expired Email When a Member Is Given a Grace Period

my_pmpro_skip_expiration_email_during_grace.php

<?php
/**
 * Don't Send the Membership Expired Email When a Member Is Given a Grace Period
 *
 * Pairs with the "Add a Grace Period to a Membership Level" recipe here:
 * https://www.paidmembershipspro.com/add-a-grace-period/
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

/**
 * Remember which membership level is currently being expired.
 */
function my_pmpro_record_expiring_level_id( $user_id, $level_id ) {
	global $my_pmpro_expiring_level_id;
	$my_pmpro_expiring_level_id = $level_id;
}
add_action( 'pmpro_membership_post_membership_expiry', 'my_pmpro_record_expiring_level_id', 5, 2 );

/**
 * Skip the membership expired email when that level is active again (a grace period).
 */
function my_pmpro_skip_expiration_email_during_grace( $send_email, $user_id ) {
	global $my_pmpro_expiring_level_id;

	// Nothing recorded, so this email isn't part of an expiration we tracked.
	if ( empty( $my_pmpro_expiring_level_id ) ) {
		return $send_email;
	}

	$level_id = $my_pmpro_expiring_level_id;

	// Reset now so a later expiration in the same request can't reuse this level ID.
	$my_pmpro_expiring_level_id = null;

	// The level that just expired is active again, so the member is in a grace period.
	if ( pmpro_getSpecificMembershipLevelForUser( $user_id, $level_id ) ) {
		return false;
	}

	return $send_email;
}
add_filter( 'pmpro_send_expiration_email', 'my_pmpro_skip_expiration_email_during_grace', 10, 2 );