WordPress给文章添加文章索引和文章目录免插件

function article_index($content) {
$matches = array();
$ul_li = '';
$r = "/([^<]+)</h3>/im";
if(preg_match_all($r, $content, $matches)) {
foreach($matches[1] as $num => $title) {
$content = str_replace($matches[0][$num], ''.$title.'', $content);
$ul_li .= ''.$title."n";
}
$content = "n
文章目录
n" . $ul_li . "
n" . $content;
}
return $content;
}
add_filter( "the_content", "article_index" );

#article-index {
-moz-border-radius: 6px 6px 6px 6px;
border: 1px solid #DEDFE1;
float: right;
margin: 0 0 15px 15px;
padding: 0 6px;
width: 200px;
line-height: 23px;
}
#article-index strong {
border-bottom: 1px dashed #DDDDDD;
display: block;
line-height: 30px;
padding: 0 4px;
}
#index-ul {
margin: 0;
padding-bottom: 10px;
}
#index-ul li {
background: none repeat scroll 0 0 transparent;
list-style-type: disc;
padding: 0;
margin-left: 20px;
}