如何从服务器下载内容到下载文件夹

我将在$attachments['attachment']中获取内容。它只是使用fopen和fwrite将文件保存在与脚本相同的位置，fopen和fwrite只是移动内容。我想要的内容被下载为正常下载。我已经提到了许多网站，但它没有用。有人能帮帮我吗??

<?php
set_time_limit(3000); 
$hostname = '{imap.gmail.com:993/imap/ssl}INBOX';
$username = 'YOUR_GMAIL_USERNAME'; # e.g somebody@gmail.com
$password = 'YOUR_GMAIL_PASSWORD';
$inbox = imap_open($hostname,$username,$password) or die('Cannot connect   to Gmail: ' . imap_last_error());
$emails = imap_search($inbox,'ALL');
$max_emails = 16;
if($emails) {
$count = 1;
rsort($emails);
foreach($emails as $email_number) 
{
    $overview = imap_fetch_overview($inbox,$email_number,0);
    $message = imap_fetchbody($inbox,$email_number,2);
    $structure = imap_fetchstructure($inbox, $email_number);
    $attachments = array();
    if(isset($structure->parts) && count($structure->parts)) 
    {
        for($i = 0; $i < count($structure->parts); $i++) 
        {
            $attachments[$i] = array(
                'is_attachment' => false,
                'filename' => '',
                'name' => '',
                'attachment' => ''
            );
            if($structure->parts[$i]->ifdparameters) 
            {
                foreach($structure->parts[$i]->dparameters as $object) 
                {
                    if(strtolower($object->attribute) == 'filename') 
                    {
                        $attachments[$i]['is_attachment'] = true;
                        $attachments[$i]['filename'] = $object->value;
                    }
                }
            }
            if($structure->parts[$i]->ifparameters) 
            {
                foreach($structure->parts[$i]->parameters as $object) 
                {
                    if(strtolower($object->attribute) == 'name') 
                    {
                        $attachments[$i]['is_attachment'] = true;
                        $attachments[$i]['name'] = $object->value;
                    }
                }
            }
            if($attachments[$i]['is_attachment']) 
            {
                $attachments[$i]['attachment'] = imap_fetchbody($inbox, $email_number, $i+1);
                /* 4 = QUOTED-PRINTABLE encoding */
                if($structure->parts[$i]->encoding == 3) 
                { 
                    $attachments[$i]['attachment'] =    base64_decode($attachments[$i]['attachment']);
                }
                /* 3 = BASE64 encoding */
                elseif($structure->parts[$i]->encoding == 4) 
                { 
                    $attachments[$i]['attachment'] = quoted_printable_decode($attachments[$i]['attachment']);
                }
            }
        }
    }
    /* iterate through each attachment and save it */
    foreach($attachments as $attachment)
    {
        if($attachment['is_attachment'] == 1)
        {
            $filename = $attachment['name'];
            if(empty($filename)) $filename = $attachment['filename'];
            if(empty($filename)) $filename = time() . ".dat";
            /* prefix the email number to the filename in case two emails
             * have the attachment with the same file name.
             */
            **$fp = fopen($email_number . "-" . $filename, "w+");
            fwrite($fp, $attachment['attachment']);**
            fclose($fp);
        }
    }
    if($count++ >= $max_emails) break;
}
} 
/* close the connection */
imap_close($inbox);
echo "Done";
?>