?$conn?=?@mysql_connect("localhost","username","password");??//手打 ?$conn?=?@mysql_connect("localhost","username","password");??//慕課網上的 ?復制慕課網上的就可以，代碼有什么不同嗎？？？<?php ??$conn = @mysql_connect("localhost","username","password");?echo "出錯了，錯誤原因是：".$php_errormsg;?>