Вложение Mail PHP

$sendFile = true; 
$fp = fopen($filePath, "r"); 
if(!$fp) 
{ 
  $sendFile = false; 
} 
 
if($sendFile == true) 
{ 
  $file = fread($fp, filesize($filePath)); 
	fclose($fp); 
				 
	$boundary = "--".md5(uniqid(time()));  
	$mailHeaders =  
		'MIME-Version: 1.0' . "\r\n". 
		'Content-Type: multipart/mixed; boundary="' . $boundary . '"'."\r\n". 
		'From: active@mail.ru' . "\r\n" . 
		'Reply-To: active@mail.ru' . "\r\n" . 
		'X-Mailer: PHP/' . phpversion(); 
					 
  $multipart =  
		'--' . $boundary . "\r\n". 
		'Content-type: text/html;' . "\r\n". 
		'Content-Transfer-Encoding: base64' . "\r\n" . "\r\n". 
		chunk_split(base64_encode($message)); 
					 
	$message_part =  
		"\r\n" . '--' . $boundary . "\r\n". 
		'Content-Type: application/octet-stream; name=' . $fileName . "\r\n". 
		'Content-Transfer-Encoding: base64' . "\r\n". 
		'Content-Disposition: attachment;' . "\r\n". 
		chunk_split(base64_encode($file)). 
		"\r\n--" . $boundary . "--\r\n"; 
					 
	$multipart .= $message_part; 
				 
	mail($to, $subject, $multipart, $mailHeaders); 
}