(PHP 5 >= 5.2.3)
mysql_set_charset — Sets the client character set
Sets the default character set for the current connection.
A valid character set name.
MySQL 连接。如不指定连接标识，则使用由 mysql_connect() 最近打开的连接。如果没有找到该连接，会尝试不带参数调用 mysql_connect() 来创建。如没有找到连接或无法建立连接，则会生成 E_WARNING 级别的错误。
成功时返回 TRUE， 或者在失败时返回 FALSE.
Note:
This function requires MySQL 5.0.7 or later.
Note:
This is the preferred way to change the charset. Using mysql_query() to execute SET NAMES .. is not recommended.