PHP显示搜索引擎来的关键词的函数

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：

<?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://yige.org/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 } ?>

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