<?php
/* notes from Dan Potter:
Sure. I changed a few other things in here too though. One is that I let
you specify what the destination filename is (i.e., what is shows up as in
the attachment). This is useful since in a web submission you often can't
tell what the filename was supposed to be from the submission itself. I
also added my own version of chunk_split because our production version of
PHP doesn't have it. You can change that back or whatever though =).
Finally, I added an extra "\n" before the message text gets added into the
MIME output because otherwise the message text wasn't showing up.
/*
note: someone mentioned a command-line utility called 'mutt' that 
can mail attachments.
*/
/* 
If chunk_split works on your system, change the call to my_chunk_split
to chunk_split 
*/
/* Note: if you don't have base64_encode on your sytem it will not work */

// simple class that encapsulates mail() with addition of mime file attachment.
class CMailFile {
        var $subject;
        var $addr_to;
        var $text_body;
        var $text_encoded;
        var $mime_headers;
        var $mime_boundary = "--==================_846811060==_";
        var $smtp_headers;
        
        function CMailFile($subject,$to,$from,$msg,$filename,$mimetype = "application/octet-stream", $mime_filename = false) {
                $this->subject = $subject;
                $this->addr_to = $to;
                $this->smtp_headers = $this->write_smtpheaders($from);
                $this->text_body = $this->write_body($msg);
                $this->text_encoded = $this->attach_file($filename,$mimetype,$mime_filename);
                $this->mime_headers = $this->write_mimeheaders($filename, $mime_filename);
        }

        function attach_file($filename,$mimetype,$mime_filename) {
                $encoded = $this->encode_file($filename);
                if ($mime_filename) $filename = $mime_filename;
                $out = "--" . $this->mime_boundary . "\n";
                $out = $out . "Content-type: " . $mimetype . "; name=\"$filename\";\n";         
                $out = $out . "Content-Transfer-Encoding: base64\n";
                $out = $out . "Content-disposition: attachment; filename=\"$filename\"\n\n";
                $out = $out . $encoded . "\n";
                $out = $out . "--" . $this->mime_boundary . "--" . "\n";
                return $out; 
// added -- to notify email client attachment is done
        }

        function encode_file($sourcefile) {
                if (is_readable($sourcefile)) {
                        $fd = fopen($sourcefile, "r");
                        $contents = fread($fd, filesize($sourcefile));
                        $encoded = my_chunk_split(base64_encode($contents));
                        fclose($fd);    
                }
                return $encoded;
        }

        function sendfile() {
                $headers = $this->smtp_headers . $this->mime_headers;           
                $message = $this->text_body . $this->text_encoded;
                return mail($this->addr_to,$this->subject,$message,$headers);
        }

        function write_body($msgtext) {
                $out = "--" . $this->mime_boundary . "\n";
                $out = $out . "Content-Type: text/plain; charset=\"us-ascii\"\n\n";
                $out = $out . $msgtext . "\n";
                return $out;
        }

        function write_mimeheaders($filename, $mime_filename) {
                if ($mime_filename) $filename = $mime_filename;
                $out = "MIME-version: 1.0\n";
                $out = $out . "Content-type: multipart/mixed; ";
                $out = $out . "boundary=\"$this->mime_boundary\"\n";
                $out = $out . "Content-transfer-encoding: 7BIT\n";
                $out = $out . "X-attachments: $filename;\n\n";
                return $out;
        }

        function write_smtpheaders($addr_from) {
                $out = "From: $addr_from\n";
                $out = $out . "Reply-To: $addr_from\n";
                $out = $out . "X-Mailer: PHP3\n";
                $out = $out . "X-Sender: $addr_from\n";
                return $out;
        }
}

// usage - mimetype example "image/gif"
// $mailfile = new CMailFile($subject,$sendto,$replyto,$message,$filename,$mimetype);
// $mailfile->sendfile();

// Splits a string by RFC2045 semantics (76 chars per line, end with \r\n).
// This is not in all PHP versions so I define one here manuall.
function my_chunk_split($str)
{
        $stmp = $str;
        $len = strlen($stmp);
        $out = "";
        while ($len > 0) {
                if ($len >= 76) {
                        $out = $out . substr($stmp, 0, 76) . "\r\n";
                        $stmp = substr($stmp, 76);
                        $len = $len - 76;
                }
                else {
                        $out = $out . $stmp . "\r\n";
                        $stmp = ""; $len = 0;
                }
        }
        return $out;
}

// end script
?>