how to download mails attachment to a specific folder using IMAP and php
$hostname = '{xxxx.net:143/novalidate-cert}INBOX';
        $username = 'yyy@xxxx.net';
        $password = 'zzzz';
        /* try to connect */
        $inbox = imap_open($hostname,$username,$password) or die('Cannot connect to : ' . imap_last_error());
        $emails = imap_search($inbox,'ALL');

                if($emails) {
          $output = '';
          rsort($emails);
          foreach($emails as $email_number) {
            $structure = imap_fetchstructure($inbox, $email_number);
            $name = $structure->parts[1]->dparameters[0]->value; // name of the file
            $type = $structure->parts[1]->type; //type of the file
}}

$savedir = __DIR__ . '/imap-dump/';

$inbox = new IMAPMailbox($hostname, $username, $password);
$emails = $inbox->search('ALL');
if ($emails) {
    rsort($emails);
    foreach ($emails as $email) {
        foreach ($email->getAttachments() as $attachment) {
            $savepath = $savedir . $attachment->getFilename();
            file_put_contents($savepath, $attachment);
        }
    }
}