$to = "[email protected]";
$subject = "Subject Of The Mail";
$message = "Hi there,<br/><br/>This is my message.<br><br>";
$headers = "From: From-Name<[email protected]>";
// 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/html; charset=ISO-8859-1\"\n" . "Content-Transfer-Encoding: 7bit\n\n" . $message . "\n\n";
$message .= "--{$mime_boundary}\n";
$filepath = 'uploads/'.$_FILES['image']['name'];
move_uploaded_file($_FILES['image']['tmp_name'], $filepath); //upload the file
$filename = $_FILES['image']['name'];
$file = fopen($filepath, "rb");
$data = fread($file, filesize($filepath));
fclose($file);
$data = chunk_split(base64_encode($data));
$message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$filename\"\n" .
"Content-Disposition: attachment;\n" . " filename=\"$filename\"\n" .
"Content-Transfer-Encoding: base64\n\n" . $data . "\n\n";
$message .= "--{$mime_boundary}\n";
mail($to, $subject, $message, $headers);