Drop cache on ACF options page update

drop-it-like-its-hot.php

// This is in the context of a namespaced class. 
public function acf_save_post( $post_id ) {
	// Retrieves all acf option page slugs.
	$option_slugs = array_unique(
		array_map(
			function(	$options_page	) {
				return $options_page['post_id'];
			},
			acf_get_option_pages()
		)
	);
	// This is not the post_id you're looking for…
	if ( ! in_array( $post_id, $slugs, true ) ) {
		return;
	}

	// Drop it like it's hot!

}