php开发中如何将时间戳转换为标准时间戳

//封装方法
function convert13bitTo10bit($timestamp) {
  $timestamp = $timestamp / 1000;
  return $timestamp;
}

//转换输出
$timestamp = '1630362073034';
$standard_timestamp = convert13bitTo10bit($timestamp);
echo date("Y-m-d H:i:s", $standard_timestamp);