function auto_post_link($content) {
global $post;
$content = preg_replace('/<s*imgs+[^>]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i', "<a href="".get_permalink()."" title="".$post->post_title."" ><img src="$2" alt="".$post->post_title."" /></a>", $content);
return $content;
}
add_filter ('the_content', 'auto_post_link',0);

<a href="wordpress-view-history.html" title="WordPress 添加文章瀏覽歷史功能" >
<img src="201303521.png" alt="WordPress 添加文章瀏覽歷史功能" />
</a>

function auto_post_link($content) {
global $post;
$content = preg_replace('/<s*imgs+[^>]*?srcs*=s*('|")(.*?)\1[^>]*?/?s*>/i', "<a href="".get_permalink()."" title="".$post->post_title."" ><img src="$2" alt="".$post->post_title."" /></a>", $content);

$posttags = get_the_tags();
if ($posttags) {
foreach($posttags as $tag) {
$link = get_tag_link($tag->term_id);
$keyword = $tag->name;
$content = preg_replace(''(?!((<.*?)|(<a.*?)))('. $keyword . ')(?!(([^<>]*?)>)|([^>]*?</a>))'s','<a href="'.$link.'" title="'.$keyword.'">'.$keyword.'</a>',$content,2);//最多替換2個(gè)重復(fù)的詞，避免過度SEO
}
}
return $content;
}
add_filter ('the_content', 'auto_post_link',0);