Mail Send in more than one attachment file

//Mail Send in more than one attachment file

$file1 = "./assets/$strImageName";
$file2 = "./assets/PUPUN03036250000000079.pdf";

$files = array($file1,$file2);

// email fields: to, from, subject, and so on
$to = "samrat.p@edreamz.in";
$from = "samrat.p@edreamz.in";
$subject ="Invoice";
$message = "My message";
$headers = "From: $from";

// boundary
$semi_rand = md5(time());
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

// headers for attachment
$headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$mime_boundary}\"";

// multipart boundary
$message = "This is a multi-part message in MIME format.\n\n" . "--{$mime_boundary}\n" . "Content-Type: text/plain; charset=\"iso-8859-1\"\n" . "Content-Transfer-Encoding: 7bit\n\n" . $message . "\n\n";
$message .= "--{$mime_boundary}\n";

// preparing attachments
for($x=0;$x<count($files);$x++){
 $file = fopen($files[$x],"rb");
 $data = fread($file,filesize($files[$x]));
 fclose($file);
 $data = chunk_split(base64_encode($data));
 $message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$files[$x]\"\n" .
 "Content-Disposition: attachment;\n" . " filename=\"$files[$x]\"\n" .
 "Content-Transfer-Encoding: base64\n\n" . $data . "\n\n";
 $message .= "--{$mime_boundary}\n";
}
$ok = @mail($to, $subject, $message, $headers);
if ($ok) {
  return true;
} else {
  return false;
}