php Chengdu time zone setting

With the development of the Internet, data exchange and communication are required between servers around the world. In order to ensure the accuracy of data, each server needs to set the correct time zone. When developing with PHP, it is important to set the time zone correctly. Therefore, this article will introduce how to set the Chengdu time zone in PHP.

1. What is a time zone?

Time zone refers to the way time is measured in various areas on the earth, also known as "local time". Since the Earth is a sphere, its rotation is irregular, so it has different local times at different longitudes.

2. How to set the time zone in PHP

1. Use the date_default_timezone_set() function to set the time zone

PHP 5.1.0 and above supports the date_default_timezone_set() function, you can use this Function sets the time zone in the script.

The following is a simple example:

date_default_timezone_set('Asia/Chongqing');
echo date('Y-m-d H:i:s');

Here, set the time zone to "Asia/Chongqing" (the time zone where Chengdu is located), and then use the date() function to obtain the current time and output it. The output should be a string representation of the current time.

2. Modify the php.ini file to set the time zone

php.ini is the PHP configuration file, and you can set the time zone by modifying the file. You need to find the "[Date]" part and enter in the following line:

date.timezone = Asia/Chongqing

After restarting the Apache server, you can make PHP use the "Asia/Chongqing" time zone in all scripts.

3. Use the ini_set() function to set the time zone

ini_set() is a function of PHP that can temporarily modify the PHP configuration at runtime. The following is an example of setting the time zone:

ini_set('date.timezone', 'Asia/Chongqing');
echo date('Y-m-d H:i:s');

Here, set the time zone to "Asia/Chongqing", and then use the date() function to obtain the current time and output it. The output should be a string representation of the current time.

3. Chengdu Time Zone

There are 24 time zones in the world, ranging from east to west according to longitude. China's time zone has only one "Beijing time", which is in the UTC 8 time zone and applies to the entire mainland of China.

Chengdu is a southwest border city in China, located at 104.06°E longitude in China. Many novice developers may think that Chengdu belongs to the UTC 7 time zone because the time difference between Chengdu and Bangkok is one hour. But in fact, Chengdu is still in the UTC 8 time zone. This is because the Chinese government decided to set the entire country to the same time zone to unify work schedules across the country.

4. Time zone naming rules

Time zone naming follows the "country/region" naming rules, such as "Asia/Shanghai", "Europe/Berlin", "America/New_York", etc. A complete list of time zones can be found in the official PHP documentation.

5. Summary

When developing PHP, it is very important to set the time zone correctly. PHP provides multiple ways to set the time zone, and you can choose according to your own needs. For Chengdu developers, it should be noted that Chengdu is still in the UTC 8 time zone, and the time zone needs to be set to "Asia/Chongqing" to accurately obtain the local time.

I hope this article can be helpful to beginners. Correctly setting the time zone will reduce a lot of unnecessary trouble during the development process.

The above is the detailed content of php Chengdu time zone setting. For more information, please follow other related articles on the PHP Chinese website!