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");
$referers = array(
    'http://www.baidu.com/s?cl=3&wd=%b9%e9%c0%b4&fr=vid1000',
    'http://www.baidu.com/s?tn=92506501_hao_pg&rtt=1&bsst=1&wd=%b9%e9%c0%b4',
    'http://www.baidu.com/link?url=ctbhf7aaau6lwe61pjoeh-zhgum7d3yhymrm6xixjldqtmxciea7gg49s90q-qh8whd8ano-dpnhuawbbneewebtu8tomf5k1v7xy850etlpzymcs0e_y-scjp86im6e&wd=%e5%bd%92%e6%9d%a5&tn=baidu&ie=utf-8&inputt=2980',
    'http://www.baidu.com/link?url=tin9nr6fwiy6iwwkccvf8hhhoxvuphqsyj1ydlqpy2roxktnsqs_3uxwvyjz2jpkpxf8-disorcspodum_jq2k&wd=%e5%bd%92%e6%9d%a5&tn=baidu&ie=utf-8&input', 
    'http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=%e5%bd%92%e6%9d%a5&ie=utf-8',
    'http://image.baidu.com/i?ct=503316480&z=&tn=baiduimagedetail&ipn=d&word=%e5%bd%92%e6%9d%a5&step_word=&ie=utf-8&in=17668&cl=2&lm=-1&st=&pn=6&rn=1&di=70447907090&ln=1994&fr=news&&fmq=1402285886106_r&ic=&s=&se=&sme=0&tab=&width=&height=&face=&is=&istype=&ist=&jit=&objurl=http%3a%2f%2fpic31.nipic.com%2f20130713%2f1287761_225159187345_2.jpg',
    'http://v.baidu.com/v?ct=301989888&s=25&ie=utf-8&word=%e5%bd%92%e6%9d%a5',
    'http://www.so.com/s?ie=utf-8&shb=1&src=360sou_newhome&q=%e5%bd%92%e6%9d%a5',
    'http://video.so.com/v?q=%e5%bd%92%e6%9d%a5&src=tab_www',
    'http://image.so.com/v?q=%e5%bd%92%e6%9d%a5&src=tab_video&fromurl=http%3a%2f%2fndent.oeeee.com%2fhtml%2f201309%2f16%2f258899.html',
    'http://news.so.com/ns?q=%e5%bd%92%e6%9d%a5&src=tab_video',
    'http://www.sogou.com/web?query=%e5%bd%92%e6%9d%a5&_asf=www.sogou.com&_ast=1402284372&w=01019900&p=40040100&ie=utf8&sut=6558&sst0=1402284372272&lkt=0%2c0%2c0',
    'http://www.sogou.com/web?query=%e5%bd%92%e6%9d%a5&_asf=www.sogou.com&_ast=1402284372&w=01019900&p=40040100&ie=utf8&sut=6558&sst0=1402284372272&lkt=0%2c0%2c0',
    'http://pic.sogou.com/d?query=%b9%e9%c0%b4&mood=0&picformat=0&mode=1&di=0&w=03021800&dr=1&did=1',
    'http://v.sogou.com/v?query=%b9%e9%c0%b4&p=&w=',
    'http://www.baidu.com/s?aaa=bbb',
    'http://www.baidu.com/',
    '//www.jb51.net/',
);
foreach ($referers as $r) {
  $_server['http_referer'] = $r;
  echo getkeywords(), "\n";
}

搜索引擎占有比率：

更多关于php相关内容感兴趣的读者可查看本站专题：《php字符串(string)用法总结》、《php数组(array)操作技巧大全》、《php错误与异常处理方法总结》、《php运算与运算符用法总结》、《php网络编程技巧总结》、《php基本语法入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家php程序设计有所帮助。