Custom recipe to lock down everything but the homepage. Used for the Condo Owner's Association Demo at https://coa.pmproplugin.com/

my_coa_demo_template_redirect_lock_entire_site.php

<?php
function my_coa_demo_template_redirect_lock_entire_site(){
	// If the user has a membership level, we don't need to lock down the site.
	if ( ! function_exists( 'pmpro_hasMembershipLevel' ) || pmpro_hasMembershipLevel() ) {
		return;
	}

	// If they have membership, return.
	if ( pmpro_hasMembershipLevel() ) {
		return;
	}

	global $pmpro_pages;

	$okay_pages = array( '79' );

	if ( is_front_page() || is_page( $pmpro_pages ) || is_page( $okay_pages ) || strpos( $_SERVER['REQUEST_URI'], "login" ) ) {
		return;
	}

	if ( is_user_logged_in() ) {
		wp_safe_redirect( home_url() );
		exit;
	} else {
		// 	The user needs to be redirected to log in.
		wp_safe_redirect( pmpro_login_url( get_permalink( $pmpro_pages['account'] ) ) );
		exit;
	}
}
add_action( 'template_redirect', 'my_coa_demo_template_redirect_lock_entire_site' );