function pclose (handle) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: var handle = popen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');
  // *     example 1: pclose(handle);
  // *     returns 1: true
  if (!handle || handle.opener !== 'popen') {
    return false;
  }

  try {
    delete this.php_js.resourceDataPointer[handle.id];
    delete this.php_js.resourceData[handle.id]; // Free up memory
  } catch (e) {
    return false;
  }
  return true;
}

var handle = popen('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm', 'r');
pclose(handle);

true