wp-redirect-to-referrer-after-logout.php

<?php
/**
 * Redirect to the referrer after logout.
 *
 * 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/
 */
function wp_redirect_to_referrer_after_logout() {
	global $pmpro_pages;
	$referrer = wp_get_referer();

	// if the referrer is the login page, redirect to home
	if ( strpos( $referrer, 'wp-login' ) !== false || ( ! empty( $pmpro_pages['login'] ) && strpos( $referrer, get_permalink( $pmpro_pages['login'] ) ) !== false ) ) {
		wp_safe_redirect( home_url() );
		exit;
	} else {
		// Redirect to the referrer after logout.
		wp_safe_redirect( $referrer ? $referrer : home_url() );
		exit;
	}
}
add_action( 'wp_logout', 'wp_redirect_to_referrer_after_logout' );