function g($name, $defaultValue = "") {

    // php这里区分大小写，将两者都变为小写

    $_GET = array_change_key_case ( $_GET, CASE_LOWER );

    $name = strtolower ( $name );

    $v = isset ( $_GET [$name] ) ? $_GET [$name] : "";

    if ($v == "")

        {

        $_POST = array_change_key_case ( $_POST, CASE_LOWER );

        $v = isset ( $_POST [$name] ) ?$_POST [$name] : "";

    }

            if ($v == "")

            return $defaultValue;

        else

        {

            //jc :  js_unescape($v)会引起 where ( col_subject like '%123%' ) 会变成 where ( col_subject like '%3%' )

            //$v =  js_unescape($v) ;

            $v = trim($v);

            return $v;

        }

    }

}