php时间函数出错及解决方法 php date_default_timezone_set()函数用法
php时间函数出错及解决方法:php date_default_timezone_set()函数 date.timezone时间区这些因素都是影响php时间的,最主要的问题是默认php时间函数用的是格林威治标准时间和我们的时间(北京时间)差了正好8个小时,这也是php时间函数出错解决的人口。
以前碰到一个问题问题,就是echo date(“y-m-d h:i:s”,time())回来的时间总是与实际时间对不上,今天终于在网上找到了原因和解决方法,分享如下:
从php5.1.0开始,php.ini里加入了date.timezone时间区这个选项,默认情况下是关闭的也就是显示的时间(无论用什么php命令)都是格林威治标准时间和我们的时间(北京时间)差了正好8个小时,有以下3中方法可以恢复正常的时间。
1,最简单的方法就是不要用php5.1以上的版本
2,如果一定要用,而且不能修改php.ini,则需要在关于时间的初始化的语句的
上面加上 date_default_timezone_set (XXX);
3,一劳永逸,仅限能修改php.ini。打开php.ini查找date.timezone时间区去掉前面的分号
= 后面加XXX,重启http服务(如apache2或iis等)即可。如果php.ini找不到date.timezone时间区这行,是不是就没办法了呢,当然不是啦,哈哈没有的话就自己加嘛,自己动手丰衣足食。我加了这样一句date.timezone = “PRC”,问题就搞定了,高兴一下.
关于XXX,大陆内地可用的值是:Asia/Chongqing ,Asia/Shanghai ,Asia/Urumqi (依次为重庆,上海,乌鲁木齐)
港台地区可用:Asia/Macao ,Asia/Hong_Kong ,Asia/Taipei (依次为澳门,香港,台北)
还有新加坡:Asia/Singapore
老外好像把北京漏调了
其他可用的值是:Etc/GMT-8 ,Singapore ,Hongkong ,PRC
PRC是什么?PRC是中华人民共和国啊-_-
———————————————————————————————————————
解决方式:
在页头使用date_default_timezone_set()函数设置我的默认时区为北京时间
date_default_timezone_set(‘PRC’);
echo date(‘Y-m-d H:i:s’);
时间和服务器当前时间一样了!!祝贺之
附date_default_timezone_set()函数用法如下
——————————–
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)。
——————————————————————————————
再附上时区标识符:
CET
CST6CDT
Cuba
EET
Egypt
Eire
EST
EST5EDT
Etc/GMT
Etc/GMT+0
Etc/GMT+1
Etc/GMT+10
Etc/GMT+11
Etc/GMT+12
Etc/GMT+2
Etc/GMT+3
Etc/GMT+4
Etc/GMT+5
Etc/GMT+6
Etc/GMT+7
Etc/GMT+8
Etc/GMT+9
Etc/GMT-0
Etc/GMT-1
Etc/GMT-10
Etc/GMT-11
Etc/GMT-12
Etc/GMT-13
Etc/GMT-14
Etc/GMT-2
Etc/GMT-3
Etc/GMT-4
Etc/GMT-5
Etc/GMT-6
Etc/GMT-7
Etc/GMT-8
Etc/GMT-9
Etc/GMT0
Etc/Greenwich
Etc/UCT
Etc/Universal
Etc/UTC
Etc/Zulu
Factory
GB
GB-Eire
GMT
GMT+0
GMT-0
GMT0
Greenwich
Hongkong
HST
Iceland
Iran
Israel
Jamaica
Japan
Kwajalein
Libya
MET
MST
MST7MDT
Navajo
NZ
NZ-CHAT
Poland
Portugal
PRC
PST8PDT
ROC
ROK
Singapore
Turkey
UCT
Universal
UTC
W-SU
WET

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PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

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