wordpress 开发 - 怎么用纯代码记录搜索引擎蜘蛛的爬行记录？

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// 记录蜘蛛访问记录
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    function get_naps_bot(){
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    $useragent = strtolower($_SERVER['HTTP_USER_AGENT']);
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    if (strpos($useragent, 'googlebot') !== false){
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    return 'Googlebot';
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    }
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    if (strpos($useragent, 'bingbot') !== false){
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    return 'Bingbot';
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    }
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    if (strpos($useragent, 'slurp') !== false){
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    return 'Yahoobot';
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    }
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    if (strpos($useragent, 'baiduspider') !== false){
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    return 'Baiduspider';
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    }
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    if (strpos($useragent, 'sogou web spider') !== false){
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    return 'Sogouspider';
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    }
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    if (strpos($useragent, 'haosouspider') !== false){
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    return 'HaosouSpider';
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    }
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    if (strpos($useragent, 'yodaobot') !== false){
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    return 'YodaoBot';
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    }
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    return false;
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    }
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    function nowtime(){
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    date_default_timezone_set('Asia/Shanghai');
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    $date=date("Y-m-d G:i:s");
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    return $date;
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    }
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    $searchbot = get_naps_bot();
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    if ($searchbot) {
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    $tlc_thispage = addslashes($_SERVER['HTTP_USER_AGENT']);
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    $url=$_SERVER['HTTP_REFERER'];
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    $addr=$_SERVER['REMOTE_ADDR'];
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    $file="robotslogs.txt";  //根目录下记录蜘蛛访问的文件
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    $time=nowtime();
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    $data=fopen($file,"a");
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    $PR="$_SERVER[REQUEST_URI]";
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    fwrite($data,"[$time] - $addr - $PR - $searchbot $tlc_thispage \r\n");
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    fclose($data);
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    }