IMap获取信件内容如何筛选邮件？哪位高手做过？请问了

<?php<br />
<br />
require_once('../ImapMailbox.php');<br />
<br />
// IMAP must be enabled in Google Mail Settings<br />
define('GMAIL_EMAIL', '');<br />
define('GMAIL_PASSWORD', '');<br />
define('ATTACHMENTS_DIR', dirname(__FILE__) . '/attachments');<br />
<br />
$mailbox = new ImapMailbox('{xxxx/notls}INBOX', GMAIL_EMAIL, GMAIL_PASSWORD, ATTACHMENTS_DIR, 'utf-8');<br />
$mails = array();<br />
<br />
foreach($mailbox->searchMails('ALL') as $mailId) {<br />
	$mail = $mailbox->getMail($mailId);<br />
	// $mailbox->setMailAsSeen($mail->mId);<br />
	// $mailbox->deleteMail($mail->mId);<br />
	$mails[] = $mail;<br />
}<br />
echo "<pre class="brush:php;toolbar:false">";<br />
var_dump($mails);