更新了wp的主题，但是找不到之前覆盖头像的代码了。

粘一下备用，哈哈哈。

源文作者：WP – 识别qq邮箱并获取头像 – 迷失博客

add_filter('get_avatar', 'qq_img', 10, 2);
function qq_img($avatar,$id_or_email){
    $email = '';
    //获取邮箱
    if (is_numeric($id_or_email)){
        $id = (int)$id_or_email;
        $user = get_userdata($id);
        if ($user)
            $email = $user->user_email;
    }else if(is_object($id_or_email)){
        if (!empty($id_or_email->user_id)){
            $id = (int)$id_or_email->user_id;
            $user = get_userdata($id);
            if ($user)
            $email = $user->user_email;
        }else if(!empty($id_or_email->comment_author_email)){
            $email = $id_or_email->comment_author_email;
        }
    }else{
        $email = $id_or_email;
    }
    $hash = md5(strtolower(trim($email)));
    $url = 'https://api.multiavatar.com/' . $hash . '.png';
    if(stripos($email,"@qq.com"))//判断是否为QQ邮箱
    {
        $qq=str_ireplace("@qq.com","",$email);
        if(preg_match("/^\d+$/",$qq))//正则过滤英文邮箱
        {
            $qqavatar="https://q2.qlogo.cn/headimg_dl?dst_uin=".$qq."&spec=100";
            return '<img src="'.$qqavatar.'"class="avatar avatar-50 photo" width="50" height="50" alt="avatar" />';
        }else{ //如果是英文QQ邮箱就调用Gravatar头像
            return '<img src="'.$url.'"class="avatar avatar-50 photo" width="50" height="50" alt="avatar" />';
        }
    }else{ //不是QQ邮箱
        return '<img src="'.$url.'"class="avatar avatar-50 photo" width="50" height="50" alt="avatar" />';
    }
}