Hide membership shortcode content for non-members/logged-out users when using negative levels.

pmpro-hide-membership-shortcode.php

<?php
/**
 * Hide content for logged-out and user's without levels when using [membership level="-20"] shortcode.
 * This will only hide content if negative levels are used. Default functionality remains if using "10,-20" in the level's attribute.
 * Follow this guide to add this code to your site - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 function my_custom_shortcode_check( $hasaccess, $content, $levels, $delay ) {
	
	// Check if array contains only negative numbers.
	$negative = false;
	foreach( $levels as $level ) {
		if ( $level < 0 ) {
			$negative = true;
		} else {
			$negative = false;
		}
	}

	if ( $negative && ( ! is_user_logged_in() || ! pmpro_hasMembershipLevel() ) ) {
		$hasaccess = false;
	}

	return $hasaccess;
}
add_filter( 'pmpro_member_shortcode_access', 'my_custom_shortcode_check', 10, 4 );