/**
  *    获取指定键的语言项
  *
  *    @param     none
  *    @return    mixed
  */
 static function &get($key = '')
 {
     if (MY_Lang::_valid_key($key) == false) {
         return $key;
     }
     $vkey = $key ? strtokey("{$key}", '$GLOBALS[\'VERNELANG\']') : '$GLOBALS[\'VERNELANG\']';
     $tmp = eval('if(isset(' . $vkey . '))return ' . $vkey . ';else{ return $key; }');
     return $tmp;
 }