Solution to garbled Chinese characters in PHPMailer email title

/**
 * PHPMailer email sending
 * Edit bbs.it-home.org
*/
 function smtp_main_send( $to, $subject, $message, $from, $fromName )
 {
   $mail = new PHPMailer();
   $mail->CharSet = "UTF-8"; // 设置编码
   $mail->IsSMTP(); // 设置使用SMTP服务发送
   $mail->Host = "smtp.mail.com";
   $mail->Username = "user";
   $mail->Password = "pass";
   $mail->SMTPAuth = true;
   $mail->From = $from;
   $mail->FromName = $fromName;
   if ( is_array( $to ) ) {
     foreach ( $to as $address ) {
       $mail->AddAddress( $address );
     }
   } else {
     $mail->AddAddress( $to );
   }
   $mail->Subject = $subject;
   $mail->Body = $message;
   $mail->AltBody = $message;
   $mail->IsHTML( true );
   return $mail->Send();
 }
?>

用以上的代码发送英文邮件没有问题，但发送中文邮件时标题会有乱码。

解决方法： 需要对 class.phpmailer.php 做一些修改：

修改1，1137 行： function EncodeHeader ($str, $position = 'text') {

将函数增加一个参数：

function EncodeHeader ($str, $position = 'text', $pl = 0) {
   if ( $pl ) return "=?" . $this->CharSet . "?B?" . base64_encode($str) . "?=";

修改2，796 行： $result .= $this->HeaderLine("Subject", $this->EncodeHeader(trim($this->Subject)));

将调用改为：

$result .= $this->HeaderLine("Subject", $this->EncodeHeader(trim($this->Subject),'text', 1));

即可解决中文标题乱码的问题。

附，PHPMailer邮件发送类V5.1下载地址。