Code-Snippets-Functions/Execute a function on a child site/Autoptimize/clear-cache-if-known-cache-is-cleared.txt

add_filter( 'autoptimize_filter_main_pagecachepurgeactions', 
  function( $clearcaches_array ) {
    $clearcaches_array[] = 'nginx_cache_cleared';
    return $clearcaches_array;
  },
  10,
  1
);