您可以使用get_avatar_url 筛选器（请参阅传递的参数here in the source code) 要更改化身url，只需使用get_avatar() 用户电子邮件的主题与您习惯的一样。

add_filter(\'get_avatar_url\', \'wpse_avatar_or_gravatar\', 10, 3);
function wpse_avatar_or_gravatar($url, $id_or_email, $args) {
    // was id passed via $id_or_email
    if ($id_or_email == intval($id_or_email)) {
        $userdata = get_userdata($id_or_email);
        $email = $userdata->user_email;
    }
    // was email passed via $id_or_email
    else {
        $email = $id_or_email;
    }

    $path = sprintf(\'%s/images/users/%s.jpg\',
                WP_CONTENT_DIR,
                md5($email . "customkey")
            );

        // image exists, return url
        if (file_exists($path)) {
                $url = sprintf(\'%s/images/users/%s.jpg\',
                    WP_CONTENT_URL,
                    md5($email . "customkey")
                );
        }
        else {
                $url = "https://0.gravatar.com/avatar/" . md5($email . \'customkey\') . "?s=64&d=identicon&f=y&r=g";
        }
        // image does not exist, return default avatar
        return $url;
    }