php mail函数发送邮件出现的主题subject乱码解决

解决方法来自：http://www.jb51.net/article/73670.htm
原代码：
$sjid = $_REQUEST["sjid"]; $subject = $_REQUEST["subject"]; $mailcontent = $_REQUEST["mailcontent"]; $mailcontent = stripslashes($mailcontent);

新代码：
$sjid = $_REQUEST["sjid"]; $subject = $_REQUEST["subject"]; $subject = "=?UTF-8?B?".base64_encode($subject)."?="; $mailcontent = $_REQUEST["mailcontent"]; $mailcontent = stripslashes($mailcontent);

问题解决。具体原因请参照http://www.jb51.net/article/73670.htm