SphinxClient::ResetFilters PHP Method

    function ResetFilters()
    {
        $this->_filters = array();
        $this->_anchor = array();
    }

 function search($string, $index_name = NULL)
 {
     $string = urldecode($string);
     //用PHPCWS中文分词扩展对输入的关键字进行切分
     if (mb_strlen($string, "UTF-8") > 4) {
         //大于4个汉字的关键词才调用中文分词接口
         $string = mb_convert_encoding($string, "GBK", "UTF-8");
         $ch = curl_init();
         curl_setopt($ch, CURLOPT_URL, $this->httpcws_url . urlencode($string));
         curl_setopt($ch, CURLOPT_TIMEOUT, 3);
         //3秒超时时间
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
         //返回内容不是输出
         $string_tmp = curl_exec($ch);
         curl_close($ch);
         if ($string_tmp != "") {
             $string = mb_convert_encoding($string_tmp, "UTF-8", "GBK");
         }
     }
     $sphinx_query_oldarr = explode(" ", $string);
     foreach ($sphinx_query_oldarr as $key => $value) {
         if (substr($value, 0, 1) == "@" || $value == "|") {
             $sphinx_query_newarr[$key] = $value;
             //不加引号
         } else {
             if ($this->is_chinese($value, "GBK") == 1 || $this->is_chinese($value, "GBK") == 2) {
                 //如果该字符串全部是中文、中英文混合
                 $sphinx_query_newarr[$key] = "\"" . $value . "\"";
                 //关键字加上引号
             } else {
                 $sphinx_query_newarr[$key] = $value;
                 //如果不是汉字则不加引号
             }
         }
     }
     $this->search_string = implode(" ", $sphinx_query_newarr);
     unset($sphinx_query_oldarr, $sphinx_query_newarr);
     if (NULL !== $index_name) {
         //多个索引查询
         if (is_array($index_name)) {
             $index_names = '';
             foreach ($index_name as &$label) {
                 if (isset($this->indexes[$label])) {
                     $index_names .= $this->indexes[$label] . ' ';
                 }
             }
             $this->index_name = $index_names;
         } else {
             if (isset($this->indexes[$index_name])) {
                 $this->index_name = $this->indexes[$index_name];
             }
         }
     }
     if (empty($this->index_name)) {
         exit('没有设置该' . $this->index_name . '索引' . PHP_EOL);
     }
     //清除当前设置的过滤器
     $this->sphinx->ResetFilters();
     return $this;
 }