Mail with attachment problems

Hi. I have the following code:

else if(file_exists("site".$timp.".zip"))
 {$file=fopen("site".$timp.".zip", "rb");
 $data=fread($file, filesize("site".$timp.".zip"));
 fclose($file);
 $data=chunk_split(base64_encode($data));
 $message.="Content-Type:{\"application/octet-stream\"};
"."name=\"site".$timp.".zip\"
"."Content-Disposition: attachment;
"."filename=\"site".$timp.".zip\"
"."Content-Transfer-Encoding: base64

".$data."

";
 $message.="--{{$mime_boundary}
";
 unset($data);
 unset($file);
 if(mail($to, $subject, $message, $headers))
  {header("Location: comanda_primita.html");}

The problem with it is, there is no attachment. Instead, at the end of the mail I get:

–==Multipart_Boundary_x1074db4782f70d7323f462617b73ab9dx
Content-Type:{“application/octet-stream”};
name=“site1256892830.zip”
Content-Disposition: attachment;
filename=“site1256892830.zip”
Content-Transfer-Encoding: base64

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SVA=

–{==Multipart_Boundary_x1074db4782f70d7323f462617b73ab9dx

Does anyone know what’s wrong with the code? Thank you in advance.

PS: This script also sends multiple attachments (if there are multiple files)…But since it doesn’t send even one attachment…