[PHP] write to a file

[Wade Halsey]

Hi

I have the following code

$fp=fopen($agentcode.date("m-d-Y-g-i-s").'CyberTrac.ctr', "w");
fwrite($fp,"$agentcode etc etc");

$fc = fopen($fp, 'rb');
        $attachment = fread($fc , filesize($filename));
        fclose($fc);

$mail = new html_mime_mail('X-Mailer: Html Mime Mail Class');
$mail->add_attachment($attachment, $agentcode.date("m-d-Y-g-i-s").'CyberTrac.ctr', 
'application/octet-stream');

The file is successfuly created. When it is attatched to the email however the size is 
written as 0 bytes, the filename is the same though. If I check the file on the server 
side it s perfectly ok, any ideas?

TIA
Wade