Adding the GDPR eraser functionality in WordPress to your plugin

gdpr.php

<?php

/**
 * Register the Plugin Eraser for WP Email Capture Premium
 *
 * @param  array     $erasers     All erasers.
 * @return array     $erasers     All erasers with the WP Email Capture one.
 */
function wp_email_capture_register_premium_plugin_eraser( $erasers ) {
	$erasers['wp-email-capture'] = array(
		'eraser_friendly_name' => __( 'WP Email Capture' ),
		'callback'             => 'wp_email_capture_premium_plugin_eraser',
	);

	return $erasers;
} add_filter( 'wp_privacy_personal_data_erasers', 'wp_email_capture_register_plugin_eraser', 10 );

/**
 * WP Email Capture Premium Eraser function.
 * 
 * Removes all data from the WP Email Capture tables. Including the meta table.
 *
 * @param  string  $email_address The email address we are looking to erase.
 * @param  integer $page          The page we are looking for.
 * @return array                  Array containing data on how successful the erasure process has been.
 */
function wp_email_capture_premium_plugin_eraser( $email_address, $page = 1 ) {

	$number        = 500; // Limit us to avoid timing out
	$page          = (int) $page;
	$items_removed = false;
	$tabledata     = array( WP_EMAIL_CAPTURE_TEMP_MEMBERS_TABLE, WP_EMAIL_CAPTURE_REGISTERED_MEMBERS_TABLE );

	global $wpdb;

	foreach ( $tabledata as $table ) {

		$ids = $wpdb->get_col( $wpdb->prepare( 'SELECT id FROM ' . $table . ' WHERE email = %s', $email_address ) );
	
		foreach ( $ids as $id ) {
			$metadelete = wp_email_capture_delete_meta_data_from_id( $id );
		}

		//$delete_member_sql = "DELETE FROM $table WHERE email = '%s'";
		$querysuccessful = $wpdb->delete( $table, array( 'email' => $email_address ), array( '%s' ) );

		if ( false !== $querysuccessful && true !== $items_removed ) {
			$items_removed = true;
			$rowsremoved   = $rowsremoved + $querysuccessful;
		}
	}

	// Tell core if we have more comments to work on still
	$done = $querysuccessful < $number;

	return array( 
		'items_removed'  => $items_removed,
		'items_retained' => false, // always false in this example
		'messages'       => array(), // no messages in this example
		'done'           => $done,
	);
}