Paid Membership Pro - Lock Down URL

pmpro-lock-down-url.php

<?php
/**
 * This recipe will redirect non members away from a page
 * according to the current URL address
 *
 * 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/
 */
add_action( 'init', 'my_custom_redir_on_url_slug', 20 );
function my_custom_redir_on_url_slug() {
	// First check if PMPro is active
	if ( ! function_exists( 'pmpro_hasMembershipLevel' ) || is_admin() ) {
		return;
	}

	// check on custom URL if member
	if ( strpos( $_SERVER['REQUEST_URI'], '/docs' ) ) {
		// Redirect members that doesn't belong to certain levels
		if ( ! pmpro_hasMembershipLevel( array( '9', '1', '4', '2', '5', '6', '7' ) ) ) {
			wp_safe_redirect( home_url( '/' ) );
			exit();
		}
	}
}