PHP统计页面浏览次数，带文本缓存

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    //@统计点击
    private function visit($id)
    {
        if (isset($GLOBALS['cfg_safe']['visit-article']) && $GLOBALS['cfg_safe']['visit-article'])
        {
            $file = SYS_PATH . 'cache/visit-article.txt';
            
            if (!file_exists($file))
            {
                file_put_contents($file, ',' . $id);    
            }
            else if ((time() - filectime($file)) < $GLOBALS[&#39;cfg_safe&#39;][&#39;visit-article&#39;])
            {
                file_put_contents($file, &#39;,&#39; . $id, FILE_APPEND);      
            }
            else
            {
                $string = file_get_contents($file);
                if ($string != &#39;&#39;)
                {
                    $temp = explode(&#39;,&#39;, $string);
                    foreach ($temp as $row)
                    {
                        if (empty($row))
                            continue;
                        $this->mysql->update(&#39;UPDATE `pcb_article` SET `visit` = `visit` + 1 WHERE `id` = &#39; . $row . &#39; LIMIT 1&#39;);
                    }    
                }
                unlink($file);
            } 
        }    
    }