PHP Timezones

PHP Timezones （PHP时区）

A timezone is a region of the world that has a uniform standard time for legal, commercial, and social purposes. In PHP, timezones are represented as strings that identify a geographic region, such as “America/New_York” or “Europe/London”. （时区是出于法律、商业和社会目的而采用统一标准时间的地区。在PHP中，时区表示为标识地理区域的字符串，例如“America/New_York”或“Europe/London”。）

PHP Timezone Functions #

PHP Timezone Functions （PHP时区函数）

PHP provides several functions for working with timezones. Here are some of the most commonly used functions:

1. date_default_timezone_set() #

This function sets the default timezone used by all date/time functions in a script. It takes a timezone string as its argument, such as “America/New_York” or “Europe/London”. （此函数设置脚本中所有日期/时间函数使用的默认时区。它使用时区字符串作为其参数，例如“America/New_York”或“Europe/London”。）

2. date_default_timezone_get() #

This function returns the default timezone used by all date/time functions in a script. （此函数返回脚本中所有日期/时间函数使用的默认时区。）

3. timezone_identifiers_list() #

This function returns an indexed array containing all defined timezone identifiers. （此函数返回包含所有已定义时区标识符的索引数组。）

4. timezone_abbreviations_list() #

This function returns an associative array containing timezone abbreviations and their offsets from UTC. （此函数返回包含时区缩写及其UTC偏移量的关联数组。）

5. timezone_name_from_abbr() #

This function returns the timezone name from an abbreviation. （此函数从缩写返回时区名称。）

6. timezone_offset_get() #

This function returns the timezone offset from UTC for a given timezone and date. （此函数返回给定时区和日期与UTC的时区偏移量。）

Usage Examples #

Usage Examples （使用範例:）

Let’s take a look at some practical examples of using PHP timezone functions. （让我们看一下使用PHP时区函数的一些实际示例。）

Example 1: Setting the Default Timezone #

Suppose you want to set the default timezone to “America/New_York”. You can do this using the date_default_timezone_set() function, like this:

date_default_timezone_set("America/New_York");

This sets the default timezone to “America/New_York”. （这将默认时区设置为“America/New_York”。）

Example 2: Getting the Default Timezone #

Suppose you want to get the default timezone. You can do this using the date_default_timezone_get() function, like this:

<?php

$timezone = date_default_timezone_get();
echo "The default timezone is: " . $timezone;

?>

This outputs “The default timezone is: America/New_York” (assuming the default timezone is set to “America/New_York”).

Example 3: Listing Timezone Identifiers #

Suppose you want to list all defined timezone identifiers. You can do this using the timezone_identifiers_list() function, like this:

<?php

$timezones = timezone_identifiers_list();
foreach ($timezones as $timezone) {
   echo $timezone . "\n";
}

?>

This outputs a list of all defined timezone identifiers. （这将输出所有已定义时区标识符的列表。）

Conclusion #

Conclusion （小结）

In this article, we’ve discussed PHP timezones and the functions used to work with them. We’ve explained what timezones are, and provided examples of some of the most commonly used PHP timezone functions. By using these functions in your PHP applications, you can easily work with timezones and ensure that your date and time calculations are accurate and reliable. （在本文中，我们讨论了PHP时区以及用于使用它们的函数。我们已经解释了什么是时区，并提供了一些最常用的PHP时区函数的示例。通过在PHP应用程序中使用这些函数，您可以轻松地处理时区，并确保您的日期和时间计算准确可靠。）