在写php程序中有时会出现这样的警告：
php warning: date(): it is not safe to rely on the system's timezone settings. you are *required* to use the date.timezone setting or the date_default_timezone_set() function. in case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. we selected 'utc' for '8.0/no dst' instead in......
这是因为php默认获取的时间是格林威治标准时间，所以这个时间会和标准北京时间相差8个小时，对此我们可以用如下办法解决：
1、在页头使用date_default_timezone_set('prc')设置时区为北京时间即可。
具体时区列表可参考：php中date时间相差8个小时的解决办法
2、在服务器配置文件 php.ini 中设置date.timezone的值为prc，设置好以后的为：date.timezone=prc，同时去掉前面的分号，即取消这一行代码的注释。
提示：date_timezone_set — 别名 datetime::settimezone()
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