1     /**
 2      * 参数排序
 3      *
 4      * @param array $param
 5      * @return string
 6      */
 7     public static function _getSortParams($param = [])
 8     {
 9         unset($param['sign']);
10         ksort($param);
11         $signstr = '';
12         if (is_array($param)) {
13             foreach ($param as $key => $value) {
14                 if ($value == '') {
15                     continue;
16                 }
17                 $signstr .= $key . '=' . $value . '&';
18             }
19             $signstr = rtrim($signstr, '&');
20         }
21         return $signstr;
22     }