PHP Warning: date(): It is not safe to rely on the system's timezone settings

php报错： 

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 /usr/local/apache/htdocs/test.php on line 50 。 

原因: 

   PHP所取的时间是格林威治标准时间，所以和你当地的时间会有出入格林威治标准时间和北京时间大概差8个小时左右。

解决办法： 

1、在页头使用date_default_timezone_set()设置我的默认时区为北京时间，即  

<?php 
date_default_timezone_set("PRC"); 
?>

就可以了。 

2、在php.ini中设置date.timezone的值为PRC，设置好以后的为：date.timezone=PRC，同时取消这一行代码的注释，即去掉前面的分号就可以了。