How to Prevent Articles From Clearing Cache on Save?

   $id[0] =  $doc->get('id');       //current resource
   $parentid =  $modx->getParentIds($id[0], 1, array('context' => 'web'));  //arrays of parents
   $id[1] = $parentid[0];      //first parent
   
   foreach($id as $docId) {
  $ctx = $modx->resource->get('context_key');
    /* set path to default cache file */
  $dir = MODX_CORE_PATH . 'cache/resource/' . $ctx . '/resources/' . $docId;
  $cache_file = MODX_CORE_PATH . 'cache/resource/' . $ctx . '/resources/' . $docId . '.cache.php';
  unlink($cache_file); //delete file  cache.php
  foreach(scandir($dir) as $file) {    //delete folder and content
    if ('.' === $file || '..' === $file) continue;
    if (is_dir("$dir/$file")) rmdir_recursive("$dir/$file");
    else unlink("$dir/$file");
  }
  rmdir($dir);  
   }