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.phpstudy.net/\',
);
foreach ($referers as $r) {
  $_SERVER[\'HTTP_REFERER\'] = $r;
  echo getKeywords(), "\\n";
}

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