PHP发送EMAIL类以及实现方法

<?php

class PHPMailer { public $Priority = 3; public $CharSet = 'iso-8859-1'; public $ContentType = 'text/plain'; public $Encoding = '8bit'; public $ErrorInfo = ''; public $From = 'root@localhost'; public $FromName = 'Root User'; public $Sender = ''; public $Subject = ''; public $Body = ''; public $AltBody = ''; public $WordWrap = 0; public $Mailer = 'mail'; public $Sendmail = '/usr/sbin/sendmail'; public $PluginDir = ''; public $Version = "2.1"; public $ConfirmReadingTo = ''; public $Hostname = ''; public $MessageID = ''; public $Host = 'localhost'; public $Port = 25; public $Helo = ''; public $SMTPSecure = ""; public $SMTPAuth = false; public $Username = ''; public $Password = ''; public $Timeout = 10; public $SMTPDebug = false; public $SMTPKeepAlive = false; public $SingleTo = false; private $smtp = NULL; private $to = array(); private $cc = array(); private $bcc = array(); private $ReplyTo = array(); private $attachment = array(); private $CustomHeader = array(); private $message_type = ''; private $boundary = array(); private $language = array(); private $error_count = 0; private $LE = "