解决php的“It is not safe to rely on the system’s timezone settings”问题

在使用php程序过程中出现以下错误：

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 ‘Asia/Chongqing’ for ‘CST/8.0/no DST’ instead

Warning: strtotime(): 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 ‘Asia/Chongqing’ for ‘CST/8.0/no DST’ instead

Warning: date_default_timezone_get(): 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 'Asia/Chongqing' for 'CST/8.0/no DST' instead in <b>/home/ftp/n/nimaboke/include/lib/function.base.php

从PHP 5.1.0开始当对使用date()等函数时，如果timezone设置不正确，在每一次调用时间函数时，都会产生E_NOTICE 或者 E_WARNING 信息，而又在php中，date.timezone这个选项，默认情况下是关闭的，无论用什么php命令都是格林威治标准时间，但是PHP5.3中如果没有设置部分时间类函数也会强行抛出了这个错误的。因此php出现It is not safe to rely on the system’s timezone settings的问题是因为是时区设置不正确导致的，下面提供3种解决方法，根据自己的条件选择。

方法一：（推荐、建议）

在php.ini里加上找到date.timezone项，设置date.timezone = "Asia/Shanghai"，重启服务器环境就可以了。

方法二：

在需要用到这些时间函数的时候，在页面添加代码：

date_default_timezone_set("PRC");

在页头加上设置时区代码：

ini_set('date.timezone','Asia/Shanghai');