亲测Discuz X3 屏蔽“您目前使用的 Discuz! 程序有新版本发布，请及时升级”

在Discuz X3 这个版本上亲自测试过，分享给大家

打开source/admincp/admincp_main.php

从第37行至60行的代码全部删除

if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && ($_G['setting']['showpatchnotice'] == 1 || !isset($_G['cookie']['checkpatch']))) {
    $discuz_patch = new discuz_patch();
    if($_G['setting']['showpatchnotice'] == 1) {
        $notice = $discuz_patch->fetch_patch_notice();
        if($notice['data']) {
            $shownotice = '<div class="notice"><a href="'.$basescript.'?action=patch" id="notice">'.($notice['fixed'] ? $lang['patch_fix_complete'] : $lang['patch_fix_rigth_now']).'</a></div>';
        }
    }
    if(!isset($_G['cookie']['checkpatch'])) {
        $discuz_patch->check_patch();
    }
}
if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !$shownotice && $_G['setting']['upgrade']) {
    $shownotice = '<div class="notice"><a href="'.$basescript.'?action=upgrade" id="notice">'.$lang['upgrade_right_now'].'</a></div>';
}
if($_G['uid'] && $_G['member']['allowadmincp'] == 1 && !isset($_G['cookie']['checkupgrade'])) {
    $discuz_upgrade = new discuz_upgrade();
    if($discuz_upgrade->check_upgrade()) {
        if(empty($shownotice)) {
            $shownotice = '<div class="notice"><a href="'.$basescript.'?action=upgrade" id="notice">'.$lang['upgrade_right_now'].'</a></div>';
        }
    }
    dsetcookie('checkupgrade', 1, 7200);
}