以下是相关实现代码：

复制代码 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 } ?>