How to download attachment on email using php - php

Question

I have tried to save attachment but i couldn't download attachment with this code .it create a folder for downloading file. any one? How to save a attachment on email in php?
thanks in advance
$struct = imap_fetchstructure($mbox,$msgno);
$contentParts = count($struct->parts);
if ($contentParts >= 2)
{
for ($i=2;$i<=$contentParts;$i++)
{
$att[$i-2] = imap_bodystruct($mbox,$msgno,$i);
}
for ($k=0;$k<count($att);$k++)
{
if ($att[$k]->parameters[0]->value == "us-ascii" || $att[$k]->parameters[0]->value == "US-ASCII")
{
if ($att[$k]->parameters[1]->value != "")
{
$selectBoxDisplay[$k] = $att[$k]->parameters[1]->value;
}
}
elseif ($att[$k]->parameters[0]->value != "iso-8859-1" && $att[$k]->parameters[0]->value != "ISO-8859-1")
{
$selectBoxDisplay[$k] = $att[$k]->parameters[0]->value;
}
}
}
//print_r($att);
if (count($selectBoxDisplay) > 0)
{
for ($j=0;$j<sizeof($selectBoxDisplay);$j++)
{
$strFileName = $att[$j]->parameters[0]->value;
$strFileType = strrev(substr(strrev($strFileName),0,4));
$fileContent = imap_fetchbody($mbox,$msgno,$j+2);
$ret = downloadFile($strFileType,$strFileName,$fileContent);
$selectBoxDisplay[$j] = str_replace($search,'',$selectBoxDisplay[$j]);
$filenametmp = $selectBoxDisplay[$j];
$handle = fopen($filenametmp, "w+");
fwrite($handle, $ret);
fclose($handle);
//chmod($filenametmp, 777);
}
}