On Ubuntu:
If you get '0.system' for the version, this means PHP is using system version of timezone database. For a newer version, simply upgrade 'tzdata' package without installing any PECL extensions:
sudo apt update
sudo apt install tzdata
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
timezone_version_get — 获取 timezonedb 的版本
返回当前 timezonedb 的版本。
返回一个 string。
Example #1 获取 timezonedb 版本
<?php
echo timezone_version_get();
?>
以上例程的输出类似于：
2009.7
On Ubuntu:
If you get '0.system' for the version, this means PHP is using system version of timezone database. For a newer version, simply upgrade 'tzdata' package without installing any PECL extensions:
sudo apt update
sudo apt install tzdata
On Ubutu:
If you get 0.system for the version, this means you have the version that PHP shipped with. For a newer version, you must upgrade via the PECL extension (sudo pecl install timezonedb)
http://pecl.php.net/package/timezonedb