Advanced Custom Field “nowhere” location rule

A location rule in ACF that never matches anything. Useful when you are using field groups together with the “Clone” field type.

	<?php
	/*
	Plugin Name: Advanced Custom Fields: Nowhere location rules
	Description: Adds a "Nowhere" location rule in ACF
	*/

	add_filter('acf/location/rule_types', function($rules) {

	$rules['Extra']['nowhere'] = 'Nowhere';

	return $rules;
	});

	add_filter('acf/location/rule_operators/nowhere', function($choices) {

	if(isset($choices['=='])) {
	unset($choices['==']);
	}

	if(isset($choices['!='])) {
	unset($choices['!=']);
	}

	$choices['nowhere'] = '-';

	return $choices;
	});

	add_filter('acf/location/rule_values/nowhere', function($choices) {
	return ['nowhere' => '-'];
	});

	add_filter('acf/location/rule_match/nowhere', function($match, $rule, $options) {
	return false;
	}, 10, 3);