  private function catchWarning ($errno, $errstr, $errfile, $errline) {
    $this->error[] = array(
      'error' => "Connecting to the POP3 server raised a PHP warning: ",
      'errno' => $errno,
      'errstr' => $errstr
    );
  }
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.