现在我已经将用户的时区保存在他们的数据库行中，每次打印日期时，我都会将其转换为用户的时区。我怎样才能以一种枯燥的方式做到这一点？
我应该重写Eloquent返回Carbon DateTime对象的位置吗。如果是这样的话，我应该把它放在下面的一个特征中，这样我只需要写一次吗？
<?php
use Carbon'Carbon;
use Illuminate'Database'Eloquent;
trait ConvertTimeZone {
/**
* Return a timestamp as DateTime object.
*
* @param mixed $value
* @return DateTime
*/
protected function asDateTime($value)
{
// If this value is an integer, we will assume it is a UNIX timestamp's value
// and format a Carbon object from this timestamp. This allows flexibility
// when defining your date fields as they might be UNIX timestamps here.
if (is_numeric($value))
{
return Carbon::createFromTimestamp($value);
}
// If the value is in simply year, month, day format, we will instantiate the
// Carbon instances from that fomrat. Again, this provides for simple date
// fields on the database, while still supporting Carbonized conversion.
elseif (preg_match('/^('d{4})-('d{2})-('d{2})$/', $value))
{
return Carbon::createFromFormat('Y-m-d', $value);
}
// Finally, we will just assume this date is in the format used by default on
// the database connection and use that format to create the Carbon object
// that is returned back out to the developers after we convert it here.
elseif ( ! $value instanceof DateTime)
{
$format = $this->getDateFormat();
$timezone = 'Auth::user()->timezone;
return Carbon::createFromFormat($format, $value, $timezone);
}
return Carbon::instance($value);
}
}
我将创建一个BaseModel类，扩展Eloquent，从中扩展我需要这些功能的模型。只要记住检查用户是否登录，这样我们就可以获得它的时区。示例：
models/BaseModel.php
class BaseModel extends Illuminate'Database'Eloquent'Model {
protected function asDateTime($value) {
// If Carbon receives null, it knows to use the default timezone
$tz = null;
// If the user is logged in, get it's timezone
if (Auth::check()) {
$tz = Auth::user()->timezone;
}
// If this value is an integer, we will assume it is a UNIX timestamp's value
// and format a Carbon object from this timestamp. This allows flexibility
// when defining your date fields as they might be UNIX timestamps here.
if (is_numeric($value)) {
return Carbon::createFromTimestamp($value, $tz);
}
// If the value is in simply year, month, day format, we will instantiate the
// Carbon instances from that fomrat. Again, this provides for simple date
// fields on the database, while still supporting Carbonized conversion.
elseif (preg_match('/^('d{4})-('d{2})-('d{2})$/', $value)) {
return Carbon::createFromFormat('Y-m-d', $value, $tz);
}
// Finally, we will just assume this date is in the format used by default on
// the database connection and use that format to create the Carbon object
// that is returned back out to the developers after we convert it here.
elseif ( ! $value instanceof DateTime) {
$format = $this->getDateFormat();
return Carbon::createFromFormat($format, $value, $tz);
}
return Carbon::instance($value);
}
}
models/User.php
class User extends BaseModel {
// ...
}