在 PHP 中猜测用户的时区

问题描述

从 PHP5.3 开始(我认为)，date.timezone 需要在 php.ini 文件中设置，或者设置为运行时通过 date_default_timezone_set() 函数.当您不设置此值时，您会得到一个错误，类似于以下内容:

PHP 警告:date(): 依赖系统的时区设置是不安全的.您必须使用 date.timezone 设置或 date_default_timezone_set() 函数.如果您使用了这些方法中的任何一种，但仍然收到此警告，您很可能拼错了时区标识符.我们在 LINE 行的 FILE 中选择了America/New_York"作为-4.0/DST".

我想知道它使用什么机制来猜测时区，因为它似乎非常准确，我想自己知道，以便我可以以更友好的方式向用户呈现此错误，或者让他们接受这是正确的时区.

我可能会使用 date_default_timezone_get() 函数:

string date_default_timezone_get ( void )

按优先顺序，此功能通过以下方式返回默认时区:

• 使用 date_default_timezone_set() 读取时区设置功能(如果有)
• 读取 TZ 环境变量(如果非空)(PHP 之前5.3.0)
• 读取 date.timezone ini 选项的值(如果已设置)
• 查询主机操作系统(如果支持并允许操作系统)

http://www.php.net/manual/en/function.date-default-timezone-get.php

As of PHP5.3 (I think) it became a requirement for the date.timezone to be set in the php.ini file, or to be set at runtime via the date_default_timezone_set() function. When you don't set this value you get, an error, something along the lines of this:

PHP Warning: date(): It is not safe to rely on the system's timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for '-4.0/DST' instead in FILE on line LINE.

I was wondering what mechanism it uses to guess the timezone, as it seems to be pretty accurate, and I wanted to know for myself so I can present this error in a more friendly way to the user, or allow them to accept this as the correct timezone.

I'd probably use the date_default_timezone_get() function:

string date_default_timezone_get  ( void  )

In order of preference, this function returns the default timezone by:

• Reading the timezone set using the date_default_timezone_set() function (if any)
• Reading the TZ environment variable (if non empty) (Prior to PHP 5.3.0)
• Reading the value of the date.timezone ini option (if set)
• Querying the host operating system (if supported and allowed by the OS)

http://www.php.net/manual/en/function.date-default-timezone-get.php

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