WordPress 高亮显示关键词及欢迎提示

function ls_get_delim($ref) {
    $search_engines = array    (
                            'google.com' => 'q',
                            'google.com.hk' => 'q',
                            'baidu.com' => 'wd',
                            'search.yahoo.com' => 'p',
                            'cn.search.yahoo.com' => 'p',
                            'cn.bing.com' => 'q',
                            'search.lycos.com' => 'query',
                            'youdao.com' => 'q',
                            'search.aol.com' => 'query',
                            'ask.com' => 'q',
                            'hotbot.com' => 'query',
                            'overture.com' => 'Keywords',
                            'search.netscape.com' => 'query',
                            'search.looksmart.com' => 'qt',
                            'search.earthlink.net' => 'q',
                            'search.viewpoint.com' => 'k',
                            'mamma.com' => 'query'
                            );
    $delim = FALSE;
    if (isset($search_engines[$ref])) {
        $delim = $search_engines[$ref];
    }
    return $delim;
}
function ls_get_terms($d) {
    $terms = null;
    $query_array = array();
    $query_terms = null;
    $query = explode($d.'=', $_SERVER['HTTP_REFERER']);
    $query = explode('&', $query[1]);
    $query = urldecode($query[0]);
    $query = str_replace("'", '', $query);
    $query = str_replace('"', '', $query);
    $query_array = preg_split('/[\s,\+\.]+/',$query);
    $query_terms = implode(' ', $query_array);
    $terms = htmlspecialchars(urldecode($query_terms));
    if (!seems_utf8($terms)){
        $terms=iconv("GBK", "UTF-8", $terms);
    }
    return $terms;
}
function ls_get_refer() {
    if (!isset($_SERVER['HTTP_REFERER']) || ($_SERVER['HTTP_REFERER'] == '')) return FALSE;
    $referer_info = parse_url($_SERVER['HTTP_REFERER']);
    $referer = $referer_info['host'];
    if (substr($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 ($what == 'isref') {
            return ($terms != ''?true:false);
        }
        if ($what == 'referrer') {
            $parsed = parse_url($_SERVER['HTTP_REFERER']);
            echo '<a href="http://'.$parsed['host'].'">'.$parsed['host'].'</a>';
        }
        if ($what == 'terms') { echo $terms; }
      
    }
}
function  ls_terms_filter($content){
$referer = ls_get_refer();
$output = '';
$delimiter = ls_get_delim($referer);
if($delimiter)
{
$terms = ls_get_terms($delimiter);
$terms= array_unique(preg_split("/[\s,]+/", $terms));
$contentarr = preg_split("/(<.*>)/U", $content, -1, PREG_SPLIT_DELIM_CAPTURE);
$stop = count($contentarr);
for ($i = 0; $i < $stop; $i++) {
$content = $contentarr[$i];
if ((strlen($content) > 0) && ('<' != $content{0})) {
foreach ($terms as $term) {
if (strlen($term)>1)
$content=eregi_replace("($term)","<b style='background:#ffff00;'>\\1</b>", $content);
}
}
$output .= $content;
}
return $output;
} else{
return $content;
}
}
add_filter('the_content', 'ls_terms_filter');
add_filter('comment_text', 'ls_terms_filter');
function ls_set_header() {
    if (ls_getinfo('isref')) header('Vary: Referer', FALSE);
}
add_action('init', 'ls_set_header');

<?php if (ls_getinfo('isref')) : ?>
<div id='hellobaby'>欢迎来自 <?php ls_getinfo('referrer'); ?> 的朋友！<br />推荐您 <b><a href='http://feed.wange.im' target='_blank'>点击这里</a></b> 订阅我的博客 o(∩_∩)o
<div class="closebox"><a href="javascript:void(0)" onclick="$('#hellobaby').slideUp('slow');$('.closebox').css('display','none');" title="关闭">×</a></div>
</div>
<?php endif; ?>

#hellobaby {
    background:#000000;
    border:1px solid #B3B3B3;
    color:#FFFFFF;
    font-size:14px;
    opacity:0.7;
    filter:alpha(opacity=70);
    padding:10px;
    position:absolute;
    right:0;
    top:250px;
}