最近在测试一个开源的帮助文档 wiki web help 问题不断，mysql错误提示要求将MySQL链接改为mysqli 或者pdo，按照网上的资料操作几次都失败，想着我大segmentfault高手如云，求帮忙解决

代码如下：

$_CONFIG = true;

# obvious db stuff

$CFG_USER = 'root';

$CFG_PASSWORD = '123456';

$CFG_SERVER = 'localhost';

$CFG_DATABASE = 'db';

# this is the return address for emails

$CFG_RETURN_ADDRESS = '';

# for email subject

$CFG_SITE_NAME = '';

# this if true requires registration before edit

$CFG_REGISTERED_ONLY = FALSE;

$con = mysql_connect($CFG_SERVER,$CFG_USER,$CFG_PASSWORD);

mysql_select_db($CFG_DATABASE, $con);

mysql_set_charset('utf8',$con);

//This stops SQL Injection in POST vars

foreach ($_POST as $key => $value) {

$_POST[$key] = mysql_real_escape_string(str_replace("\\","\\\\",$value));

}

//This stops SQL Injection in GET vars

foreach ($_GET as $key => $value) {

$_GET[$key] = mysql_real_escape_string(htmlspecialchars ($value,ENT_QUOTES,'UTF-8'));

}

?>