how to include image in header of email using php sendmail?

[vinstone t]

I am trying to include an image in the header using sendmail, but I keep getting syntax errors. Here is what I have:

$image = 'images/test.png';
$subject = " subject line";
$message_body = "This is message body";

$message_body .= $image;
$creator = getUserInfo($program->creator);
$rows[0]->email = $creator['email'];
SendMail($subject,$message_body,$rows);

>>> I want to show the test image after or before the message body. Is this how it is done?

Thanks.