$s =<<< TXT
<dl class=\"feed_list\" mid=\"3652509438178524\" action-type=\"feed_list_item\" >\n <dt class=\"face\">\n <a href=\"http:\/\/weibo.com\/u\/1954326033\" title=\"\u8db4\u8db4\u5c0f\u60a0\"
TXT;
echo $s = str_replace('\\"', '"', $s);
得
<dl class="feed_list" mid="3652509438178524" action-type="feed_list_item" >
<dt class="face">
<a href="http:\/\/weibo.com\/u\/1954326033" title="\u8db4\u8db4\u5c0f\u60a0"
进一步
echo preg_replace_callback('/\\\u.{4}/', 'func', $s);
function func($r) {
return json_decode('"' . $r[0] . '"');
}
得
"<dl class="feed_list" mid="3652509438178524" action-type="feed_list_item" >
<dt class="face">
<a href="http:\/\/weibo.com\/u\/1954326033" title="趴趴小悠"
