php程序时间相差8个小时的解决办法
php程序时间相差8个小时的解决办法
在使用国外主机或者本地自己配置安装的php环境中，由于默认设置的是国外的时区或者说是系统默认的时区。date函数返回的时间值和北京当地时间总是相差8小时。
解决方案是正确配置PHP的时区环境。
PHP的时区环境通过一组特定的字符串指定。最省事的办法是在php.ini文件中找到date.timezone一行，默认情况下这一行是被注释掉的，删掉前面的分号即可启用。对于中国大陆，可把它设置为Etc/GMT-8（或Asia/Sanghai、Asia/Chongqing、Asia/Urumqi、PRC）。接着再重启web服务器即可。
如果由于某种原因不能修改php.ini，可以在PHP程序开头用date_default_timezone_set()设置。例如，可以在使用date函数前先执行代码
date_default_timezone_set('Etc/GMT-8');我个人认为还是采用date_default_timezone_set函数比较好。一是通用性强，二来如果你的网站是面向全球用户的，这种方法可以让每个用户都能设置他所在的时区。
最后需要说明的是对于Etc/GMT这种写法。中国大陆采用的是东八区的时间，一般情况下都是记作+8，但PHP里来了个大反个儿，要写成Etc/GMT-8；相反地，如果你的时区是西2区，在PHP里就要写成Etc/GMT+2。这一点和常识不同，尤其要注意。
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