How to set time zone in PHP

The content of this article is about setting the time zone in PHP. Friends in need can refer to it.

Today I found something wrong with the time judgment statement in a piece of PHP code, and I studied it. I found that the problem lies in the time zone setting of PHP. The time taken by PHP defaults to Greenwich Mean Time, so it is 8 hours different from Beijing time.

After finding the reason, I searched for some time zone settings of PHP on the Internet. Method:

1. Modify php.ini, find data.timezone = in php.ini and remove the ";" in front of it, and then set data.timezone = "Asia/Shanghai";.

2. Use the function ini_set('date.timezone','Asia/Shanghai'); or date_default_timezone_set('Asia/Shanghai'); in the program code of PHP 5 or above version

Description of some commonly used time zone identifiers:

Asia/Shanghai – Shanghai
Asia/Chongqing – Chongqing
Asia/Urumqi – Urumqi
Asia/Hong_Kong – Hong Kong
Asia/Macao – Macau
Asia/Taipei – Taipei
Asia/Singapore – Singapore


Function method to set time zone:

Copy the code The code is as follows:

<?php 
function_exists(date_default_timezone_set);//在这他总是返回1,这函数是判断这里面的字符是不是一个定义了的函数名 
date_default_timezone_set("Etc/GMT");//这是格林威治标准时间,得到的时间和默认时区是一样的 
date_default_timezone_set("Etc/GMT+8");//这里比林威治标准时间慢8小时 
date_default_timezone_set("Etc/GMT-8");//这里比林威治标准时间快8小时 
date_default_timezone_set(&#39;PRC&#39;); //设置中国时区 
?>

Function ini_set() sets the time zone:
You can add ini_set('date.timezone', 'Asia/Shanghai'); // 'Asia/Shanghai' is the Shanghai time zone

Manually modify the php.ini settings
Open php and find date.timezone = "PRC" if any Remove the semicolon in front, if not, add it manually!

The following is some additional information:

You will find this problem after installing PHP5

$atime=date ("Y-m-d H:i:s");
echo $atime;
?>
Output:2006-05-16 06:36:06
What time is it now?/My It’s 14:36 ​​
Why is this?
The reason is that if you do not set the local time zone of your server in the program or configuration file
The time taken by PHP is Greenwich Mean Time, so it will be different from your local time
Greenwich The difference between standard time and Beijing time is about 8 hours. So how can we avoid time errors?
Let’s take a look at the solution:
Use date_default_timezone_set() in the header of the page to set my default time zone to Beijing time

Copy code The code is as follows:

<? 
date_default_timezone_set(&#39;PRC&#39;); 
echo date(&#39;Y-m-d H:i:s&#39;); 
?>

The time is the same as the current time of the server!
In addition, the usage of date_default_timezone_set is as follows:
------------------------ -------------------------------------------------- ----------
date_default_timezone_set
(PHP 5 >= 5.1.0RC1)
date_default_timezone_set -- Set the default time zone for all date and time functions in a script
Description
bool date_default_timezone_set ( string timezone_identifier )
date_default_timezone_set() Sets the default time zone used for all datetime functions.
Note: Since PHP 5.1.0 (the date and time functions have been rewritten in this version), if the time zone is illegal, each call to the date and time function will generate an E_NOTICE level error message.
Parameters
timezone_identifier
Time zone identifier, such as UTC or Europe/Lisbon
Return value
This function always returns TRUE (even if the timezone_identifier parameter is illegal).
-------------------------------------------------- -------------------------------------
Or modify date.timezone in php.ini Value
date.timezone = PRC

After installing PHP5 you will find this problem
$atime=date("Y-m-d H:i:s");
echo $atime;
?>
Output: 2006-05-16 06:36:06
What time is it now?/Mine is 14:36 ​​
Why is this?
The reason is that if you do not set the local time zone of your server in the program or configuration file
The time taken by PHP is Greenwich Mean Time, so it will be different from your local time
Greenwich The difference between standard time and Beijing time is about 8 hours. So how can we avoid time errors?
Let’s take a look at the solution:
Use date_default_timezone_set() in the header of the page to set my default time zone to Beijing time

Copy code The code is as follows:

<? 
date_default_timezone_set(&#39;PRC&#39;); 
echo date(&#39;Y-m-d H:i:s&#39;); 
?>

时间和服务器当前时间一样了!
另外附date_default_timezone_set用法如下:
------------------------------------------------------------------------------------
date_default_timezone_set
(PHP 5 >= 5.1.0RC1)
date_default_timezone_set -- 设定用于一个脚本中所有日期时间函数的默认时区
说明
bool date_default_timezone_set ( string timezone_identifier )
date_default_timezone_set() 设定用于所有日期时间函数的默认时区。
注: 自 PHP 5.1.0 起（此版本日期时间函数被重写了），如果时区不合法则每个对日期时间函数的调用都会产生一条 E_NOTICE 级别的错误信息。
参数
timezone_identifier
时区标识符，例如 UTC 或 Europe/Lisbon
返回值
本函数永远返回 TRUE（即使 timezone_identifier 参数不合法）。
-------------------------------------------------------------------------------------
或者修改 php.ini 中 date.timezone 值
date.timezone = PRC

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