有两个小函数有一点不懂解决思路

有两个小函数有一点不懂
1.

PHP code

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function GetFileList($model,$slevel)
    {
        $arr = array();
        $sql="select * from boxfile
                where model = '$model' and slevel > $slevel
                order by slevel asc";
        //die($sql);
        $rs = $this->db->Execute($sql);
        if($rs==true)
        {
            while (!$rs->EOF)
            {
                $arr[]=$rs->fields;
                   $rs->MoveNext(); 
            }
        }
        return $arr;
    }    

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PHP code

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    function AddGetParams($arr)
    {
        $str = '';
        
        foreach($arr as $k => $v)
            $str .= $k .':'. $v .'|';
        
        $str .=  'ip:'. $_SERVER['REMOTE_ADDR'];
        
        $sql = "insert into test(name) values('$str')";    
        
        $this->db->Execute($sql);  
        
    }

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