PHP を通じて電子メールをすばやく検索するにはどうすればよいですか?

$host = 'pop.example.com';
$port = 110;
$username = 'your_username';
$password = 'your_password';

$connection = pop3_connect($host, $port);
$login = pop3_login($connection, $username, $password);

if ($login) {
    echo 'POP3连接成功！';
} else {
    echo 'POP3连接失败！';
}

$host = 'imap.example.com';
$port = 143;
$username = 'your_username';
$password = 'your_password';

$connection = imap_open("{{$host}:$port}", $username, $password);

if ($connection) {
    echo 'IMAP连接成功！';
} else {
    echo 'IMAP连接失败！';
}

require 'PHPMailer/PHPMailerAutoload.php';

$mail = new PHPMailer();

$mail->isPop3();
$mail->Host = 'pop.example.com';
$mail->Port = 110;
$mail->Username = 'your_username';
$mail->Password = 'your_password';

$searchValue = '关键字'; // 搜索关键字
$mail->search('BODY', $searchValue, true); // 执行搜索

$mail->disconnect(); // 断开连接

$count = $mail->getResultCount();
echo "共搜索到 {$count} 封邮件。
";

if ($count > 0) {
    foreach ($mail->searched as $num) {
        echo "邮件编号：{$num}
";

        $mail->get($num); // 获取邮件内容
        $subject = $mail->Subject;
        $body = $mail->Body;

        echo "主题：{$subject}
";
        echo "正文：{$body}
";
    }
} else {
    echo "未搜索到符合条件的邮件。";
}