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

搜索引擎占有比率：

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

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