error log: PHP Notice:  Only variable references should be returned by reference

Are you trying to generate a pdf and email it?

yes - to clarify,the script already works -i'm just trying to figure out why i'm getting these log errors

You can only return variables by reference, not the result of a statement.

Note the "&" before the function name.

http://php.net/manual/en/language.references.return.php

Try this:

function &_addMixedPart()
    {
        $params['content_type'] = 'multipart/mixed';
        $return = new Mail_mimePart('', $params);
        return $return;
} 

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Try the following w/out using mime.  

		$pdfdoc = $pdf->Output("example.pdf", 'S');

    
	$to = "Youremail@yourdot.com";
	$from = "Youremail@yourdot.com";
	$subject = "Subject";
	$message = "<p>Please see the attachment.</p>";
	$separator = md5(time());
	$eol = PHP_EOL; 
	$filename = "example.pdf";
    
	$attachment = chunk_split(base64_encode($pdfdoc));
	$headers = "From: ".$from.$eol;
	$headers .= "MIME-Version: 1.0".$eol;
	$headers .= "Content-Type: multipart/mixed; boundary=\"".$separator."\"".$eol.$eol;
	$headers .= "Content-Transfer-Encoding: 7bit".$eol;
	$headers .= "This is a MIME encoded message.".$eol.$eol;
	$headers .= "--".$separator.$eol;
	$headers .= "Content-Type: text/html; charset=\"iso-8859-1\"".$eol;
	$headers .= "Content-Transfer-Encoding: 8bit".$eol.$eol;
	$headers .= $message.$eol.$eol;
	$headers .= "--".$separator.$eol;
	$headers .= "Content-Type: application/octet-stream; name=\"".$filename."\"".$eol;
	$headers .= "Content-Transfer-Encoding: base64".$eol;
	$headers .= "Content-Disposition: attachment".$eol.$eol;
	$headers .= $attachment.$eol.$eol;
	$headers .= "--".$separator."--";

	if(mail($to, $subject, "$message", $headers)){
		?>
	<script type="text/javascript"><!--
    alert("Alert message!");
    window.location = "index.php";
    --></script>
	<?php
}
?>

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Thanks!