Attach image to email without saving to disk

Does anyone know of a way to attach jpg image created in php without having to save the file to the server before attaching it?

I am using this MIME code to attach the image to an email –

[code=php]
for($i=0;$i<$max;$i++)
{
$file = fread(fopen($this->attachment[$i], “r”), filesize($this->attachment[$i]));
$this->header .= “–“.$this->boundary.”n”;
$this->header .= “Content-Type: application/x-zip-compressed; name=”.$this->attachment[$i].”n”;
$this->header .= “Content-Transfer-Encoding: base64n”;
$this->header .= “Content-Disposition: attachment; filename=”.$this->attachment[$i].”nn”;
$this->header .= chunk_split(base64_encode($file)).”n”;
$file = “”;
}
[/code]

Can I attach the image stored as a variable for instance?

Also in #PHP _↴