使用php显示搜索引擎来的关键词

使用php显示搜索引擎来的关键词

 在访客从搜索引擎而来的第一个页面上显示访客搜索的关键词，根据这个关键词做出一些提高网站交互能力的改变，比如显示这个关键词相关的其它文章

以下是相关实现代码：

代码如下:

<?php

/*

Plugin Name: display-search-keywords

Plugin URI: http://www.imyxiao.com/1531.html

Description: 当访客通过搜索引擎来到你的博客，这个插件可以显示访客搜索的关键词

Version: 1.0

Author:<a href="http://www.imyxiao.com/">仰肖</a>

*/

function unescape($str) {

 $ret = '';

 $len = strlen($str);

 for ($i = 0; $i < $len; $i++) {

  if ($str[$i] == '%' && $str[$i +1] == 'u') {

   $val = hexdec(substr($str, $i +2, 4));

   if ($val < 0x7f)

    $ret .= chr($val);

   else

    if ($val < 0x800)

     $ret .= chr(0xc0 | ($val >> 6)) . chr(0x80 | ($val & 0x3f));

    else

     $ret .= chr(0xe0 | ($val >> 12)) . chr(0x80 | (($val >> 6) & 0x3f)) . chr(0x80 | ($val & 0x3f));

 

   $i += 5;

  } else

   if ($str[$i] == '%') {

    $ret .= urldecode(substr($str, $i, 3));

    $i += 2;

   } else

    $ret .= $str[$i];

 }

 return $ret;

}

function ls_get_delim($ref) {

 $search_engines = array (

  'google.com.hk' => 'q',

  'google.com.tw' => 'q',

  'go.google.com' => 'q',

  'google.com' => 'q',

  'blogsearch.google.com' => 'q',

  'cn.bing.com' => 'q',

  'one.cn.yahoo.com' => 'p',

  'baidu.com' => 'wd',

  'soso.com' => 'w',

  'youdao.com' => 'q',

  'sogou.com' => 'query'

 );

 $delim = false;

 // 判断

 if (isset ($search_engines[$ref])) {

  $delim = $search_engines[$ref];

 }

 return $delim;

}

 

function ls_get_refer() {

 // 判断前一页面的 URL 地址

 $queryString = $_GET['referer'];

 $queryString = unescape($queryString);

 if (!isset ($queryString) || ($queryString == ''))

  return false;

 $referer_info = parse_url($queryString);

 $referer = $referer_info['host'];

 //去除www.

 if (substr($referer, 0, 4) == 'www.')

  $referer = substr($referer, 4);

 return $referer;

}

 

function ls_getinfo($what) {

 $referer = ls_get_refer();

 if (!$referer)

  return false;

 $delimiter = ls_get_delim($referer);

 if ($delimiter) {

  $terms = ls_get_terms($delimiter);

  if ($what == 'isref' && $terms != '') {

   return true;

  }

  if ($what == 'terms') {

   echo $terms;

  }

 }

 return false;

}

 

function yxiao_seems_utf8($str) {

 $length = strlen($str);

 for ($i = 0; $i < $length; $i++) {

  $c = ord($str[$i]);

  if ($c < 0x80)

   $n = 0; # 0bbbbbbb

  elseif (($c & 0xE0) == 0xC0) $n = 1; # 110bbbbb

  elseif (($c & 0xF0) == 0xE0) $n = 2; # 1110bbbb

  elseif (($c & 0xF8) == 0xF0) $n = 3; # 11110bbb

  elseif (($c & 0xFC) == 0xF8) $n = 4; # 111110bb

  elseif (($c & 0xFE) == 0xFC) $n = 5; # 1111110b

  else

   return false; # Does not match any model

  for ($j = 0; $j < $n; $j++) { # n bytes matching 10bbbbbb follow ?

   if ((++ $i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))

    return false;

  }

 }

 return true;

}

 

function ls_get_terms($d) {

 //取得查询值

 $queryString = $_GET['referer'];

 $queryString = unescape($queryString);

 $query_str = parse_url($queryString);

 parse_str($query_str[query], $query_str);

 $query = $query_str[$d];

 $query = urldecode($query);

 

 $query = str_replace("'", '', $query);

 $query = str_replace('"', '', $query);

 $query_array = preg_split('/[s,+.]+/', $query);

 $query_terms = implode(' ', $query_array);

 $terms = htmlspecialchars($query_terms);

 //gbk->utf8

 if (!yxiao_seems_utf8($terms)) {

  $terms = iconv("GBK", "UTF-8//IGNORE", $terms);

 }

 return $terms;

}

if (ls_getinfo('isref')) {

?>

document.write('<div id="serp"><p>')

document.write('更多搜索结果：<em><a href="http://www.jb51.net/search?q=<?php ls_getinfo(terms); ?>" ')

document.write('title="查看<?php ls_getinfo(terms); ?>的搜索结果" rel="nofollow"><?php ls_getinfo(terms); ?></a></em>')

document.write('</p></div>');

<?php } ?>