PHP把时间转换成几分钟前、几小时前、几天前

function get_time_ago($ptime) {
	$ptime = strtotime($ptime);
	$etime = time() - $ptime;
	if ($etime < 1) {
		return '刚刚';
	}

	$interval = array(
		12 * 30 * 24 * 60 * 60 => '年前 (' . date('Y-m-d', $ptime) . ')',
		30 * 24 * 60 * 60 => '个月前 (' . date('m-d', $ptime) . ')',
		7 * 24 * 60 * 60 => '周前 (' . date('m-d', $ptime) . ')',
		24 * 60 * 60 => '天前',
		60 * 60 => '小时前',
		60 => '分钟前',
		1 => '秒前',
	);
	foreach ($interval as $secs => $str) {
		$d = $etime / $secs;
		if ($d >= 1) {
			$r = round($d);
			return $r . $str;
		}
	};
}
$data='2021-3-28 10:30:20';
echo get_time_ago($data);