使用imap_body仅获取电子邮件正文的某个部分

// 连接到IMAP服务器
$mailbox = "{mail.example.com:993/imap/ssl}INBOX";
$username = "username";
$password = "password";
$connection = imap_open($mailbox, $username, $password) or die("Cannot connect: " . imap_last_error());

// 获取邮件ID
$email_id = imap_search($connection, "ALL");

// 获取邮件正文
$email_body = imap_fetchbody($connection, $email_id[0], 1.1);

// 提取正文的某个部分
$pattern = "/<div class='content'>(.*?)<\/div>/s";
preg_match($pattern, $email_body, $matches);

// 输出提取的部分
echo $matches[1];

// 关闭连接
imap_close($connection);