在訪客從搜索引擎而來的第一個頁面上顯示訪客搜索的關鍵詞，根據這個關鍵詞做出一些提高網站交互能力的改變，比如顯示這個關鍵詞相關的其它文章
以下是相關實現代碼： 代碼如下: <?php /* Plugin Name: display-search-keywords Plugin URI: http://www.imyxiao.com/1531.html Description: 當訪客通過搜索引擎來到你的博客，這個插件可以顯示訪客搜索的關鍵詞 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' ); $delim = false; // 判斷 if (isset ($search_engines[$ref])) { $delim = $search_engines[$ref]; } return $delim; } function ls_get_refer() { // 判斷前一頁面的 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) { //取得查詢值 $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('更多搜索結果：<em><a href="http://www.jb51.net/search?q=<?php ls_getinfo(terms); ?>" ') document.write('title="查看<?php ls_getinfo(terms); ?>的搜索結果" rel="nofollow"><?php ls_getinfo(terms); ?></a></em>') document.write('</p></div>'); <?php } ?>
