private function checkResponse($string)
{
if (substr($string, 0, 3) !== '+OK') {
$this->error = array('error' => "Server reported an error: {$string}", 'errno' => 0, 'errstr' => '');
if ($this->do_debug >= 1) {
$this->displayErrors();
}
return false;
} else {
return true;
}
}