PHP自定义函数获取搜索引擎来源关键字的方法

本文实例讲述了PHP自定义函数获取搜索引擎来源关键字的方法。分享给大家供大家参考，具体如下：

获取搜索引擎来源关键字的函数：

    function getKeywords() {
      // 搜索引擎关键字映射
      static $host_keyword_map = array(
          'www.baidu.com' => 'wd',
          'v.baidu.com' => 'word',
          'image.baidu.com' => 'word',
          'news.baidu.com' => 'word',
          'www.so.com' => 'q',
          'video.so.com' => 'q',
          'image.so.com' => 'q',
          'news.so.com' => 'q',
          'www.sogou.com' => 'query',
          'pic.sogou.com' => 'query',
          'v.sogou.com' => 'query',
      );
      // 检查来源是否搜索引擎
      if (!isset($_SERVER['HTTP_REFERER'])) {
        return '';
      }
      $urls = parse_url($_SERVER['HTTP_REFERER']);
      if (!array_key_exists($urls['host'], $host_keyword_map)) {
        return '';
      }
      $key = $host_keyword_map[$urls['host']];
      // 检查关键字参数是否存在
      if (!isset($urls['query'])) {
        return '';
      }
      $params = array();
      parse_str($urls['query'], $params);
      if (!isset($params[$key])) {
        return '';
      }
      $keywords = $params[$key];
      // 检查编码
      $encoding = mb_detect_encoding($keywords, 'utf-8,gbk');
      if ($encoding != 'utf-8') {
        $keywords = iconv($encoding, 'utf-8', $keywords);
      }
      return $keywords;
    }

函数测试：

    <?php
    header("Content-Type: text/html; charset=utf-8");
    $referers = array(
        'http://www.baidu.com/s?cl=3&wd;=%B9%E9%C0%B4&fr;=vid1000',
        'http://www.baidu.com/s?tn=92506501_hao_pg&rtt;=1&bsst;=1&wd;=%B9%E9%C0%B4',
        'http://www.baidu.com/link?url=ctBhF7AAau6LwE61pJOEH-ZhgUM7D3YHYMrm6xIXJlDQtMXCiea7gg49s90Q-Qh8wHD8Ano-dPNhUawBBNEEwEbtu8toMF5k1V7Xy850EtlpZyMcS0e_y-SCJp86iM6e&wd;=%E5%BD%92%E6%9D%A5&tn;=baidu&ie;=utf-8&inputT;=2980',
        'http://www.baidu.com/link?url=TIn9NR6fwiy6IwwkCcVF8HhHoxVUpHQsyj1YdlQPy2roXKTnSQS_3UxwvyjZ2JPkpxF8-diSoRCSpODUM_jq2K&wd;=%E5%BD%92%E6%9D%A5&tn;=baidu&ie;=utf-8&input;', 
        'http://news.baidu.com/ns?cl=2&rn;=20&tn;=news&word;=%E5%BD%92%E6%9D%A5&ie;=utf-8',
        'http://image.baidu.com/i?ct=503316480&z;=&tn;=baiduimagedetail&ipn;=d&word;=%E5%BD%92%E6%9D%A5&step;_word=&ie;=utf-8&in;=17668&cl;=2&lm;=-1&st;=&pn;=6&rn;=1&di;=70447907090&ln;=1994&fr;=news&&fmq;=1402285886106_R&ic;=&s;=&se;=&sme;=0&tab;=&width;=&height;=&face;=&is;=&istype;=&ist;=&jit;=&objurl;=http%3A%2F%2Fpic31.nipic.com%2F20130713%2F1287761_225159187345_2.jpg',
        'http://v.baidu.com/v?ct=301989888&s;=25&ie;=utf-8&word;=%E5%BD%92%E6%9D%A5',
        'http://www.so.com/s?ie=utf-8&shb;=1&src;=360sou_newhome&q;=%E5%BD%92%E6%9D%A5',
        'http://video.so.com/v?q=%E5%BD%92%E6%9D%A5&src;=tab_www',
        'http://image.so.com/v?q=%E5%BD%92%E6%9D%A5&src;=tab_video&fromurl;=http%3A%2F%2Fndent.oeeee.com%2Fhtml%2F201309%2F16%2F258899.html',
        'http://news.so.com/ns?q=%E5%BD%92%E6%9D%A5&src;=tab_video',
        'http://www.sogou.com/web?query=%E5%BD%92%E6%9D%A5&_asf=www.sogou.com&_ast=1402284372&w;=01019900&p;=40040100&ie;=utf8&sut;=6558&sst0;=1402284372272&lkt;=0%2C0%2C0',
        'http://www.sogou.com/web?query=%E5%BD%92%E6%9D%A5&_asf=www.sogou.com&_ast=1402284372&w;=01019900&p;=40040100&ie;=utf8&sut;=6558&sst0;=1402284372272&lkt;=0%2C0%2C0',
        'http://pic.sogou.com/d?query=%B9%E9%C0%B4&mood;=0&picformat;=0&mode;=1&di;=0&w;=03021800&dr;=1&did;=1',
        'http://v.sogou.com/v?query=%B9%E9%C0%B4&p;=&w;=',
        'http://www.baidu.com/s?aaa=bbb',
        'http://www.baidu.com/',
        'http://www.jb51.net/',
    );
    foreach ($referers as $r) {
      $_SERVER['HTTP_REFERER'] = $r;
      echo getKeywords(), "\n";
    }

搜索引擎占有比率：

http://engine.data.cnzz.com/

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