PHP 格式化时间显示刚刚、几分钟前、昨天、前天

function uc_time_ago($ptime) {
    date_default_timezone_set('PRC');

    $ptime = strtotime($ptime);

    $etime = time() - $ptime;

    switch ($etime){
        case $etime <= 60:

            $msg = '刚刚';

            break;

        case $etime > 60 && $etime <= 60 * 60:

            $msg = floor($etime / 60) . ' 分钟前';

            break;

        case $etime > 60 * 60 && $etime <= 24 * 60 * 60:

            $msg = date('Ymd',$ptime)==date('Ymd',time()) ? '今天 '.date('H:i',$ptime) : '昨天 '.date('H:i',$ptime);

            break;

        case $etime > 24 * 60 * 60 && $etime <= 2 * 24 * 60 * 60:

            $msg = date('Ymd',$ptime)+1==date('Ymd',time()) ? '昨天 '.date('H:i',$ptime) : '前天 '.date('H:i',$ptime);

            break;

        case $etime > 2 * 24 * 60 * 60 && $etime <= 12 * 30 * 24 * 60 * 60:

            $msg = date('Y',$ptime)==date('Y',time()) ? date('m-d H:i',$ptime) : date('Y-m-d H:i',$ptime);

            break;

        default: $msg = date('Y-m-d H:i',$ptime);

    }

    return $msg;

}