wordpress主机网站升级更新后出现错误：Warning: mysql_connect() [function.mysql-connect]: Headers and client library minor version mismatch. Headers:50626 Library:50544 in /home/public_html/wp-includes/wp-db.php on line 1515

根据提示在wp-includes文件夹中找到wp-db.php，通过记事本工具或Notepad+（推荐百度下载，会直接标注1515行）找到1515行中的（搜索：mysql_connect）：$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );

在mysql_connect之前增加个”@”保存后上传到空间里替换即可。