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translating---geekpi
How To Switch Between Multiple PHP Versions In Ubuntu
======
![](https://www.ostechnix.com/wp-content/uploads/2018/08/php-720x340.png)
Sometimes, the most recent version of an installed package might not work as you expected. Your application may not compatible with the updated package and support only a specific old version of package. In such cases, you can simply downgrade the problematic package to its earlier working version in no time. Refer our old guides on how to downgrade a package in Ubuntu and its variants [**here**][1] and how to downgrade a package in Arch Linux and its derivatives [**here**][2]. However, you need not to downgrade some packages. We can use multiple versions at the same time. For instance, let us say you are testing a PHP application in [**LAMP stack**][3] deployed in Ubuntu 18.04 LTS. After a while you find out that the application worked fine in PHP5.6, but not in PHP 7.2 (Ubuntu 18.04 LTS installs PHP 7.x by default). Are you going to reinstall PHP or the whole LAMP stack again? Not necessary, though. You don’t even have to downgrade the PHP to its earlier version. In this brief tutorial, I will show you how to switch between multiple PHP versions in Ubuntu 18.04 LTS. It’s not that difficult as you may think. Read on.
### Switch Between Multiple PHP Versions
To check the default installed version of PHP, run:
```
$ php -v
PHP 7.2.7-0ubuntu0.18.04.2 (cli) (built: Jul 4 2018 16:55:24) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.7-0ubuntu0.18.04.2, Copyright (c) 1999-2018, by Zend Technologies
```
As you can see, the installed version of PHP is 7.2.7. After testing your application for couple days, you find out that your application doesn’t support PHP7.2. In such cases, it is a good idea to have both PHP5.x version and PHP7.x version, so that you can easily switch between to/from any supported version at any time.
You don’t need to remove PHP7.x or reinstall LAMP stack. You can use both PHP5.x and 7.x versions together.
I assume you didn’t uninstall php5.6 in your system yet. Just in case, you removed it already, you can install it again using a PPA like below.
You can install PHP5.6 from a PPA:
```
$ sudo add-apt-repository -y ppa:ondrej/php
$ sudo apt update
$ sudo apt install php5.6
```
#### Switch from PHP7.x to PHP5.x
First disable PHP7.2 module using command:
```
$ sudo a2dismod php7.2
Module php7.2 disabled.
To activate the new configuration, you need to run:
systemctl restart apache2
```
Next, enable PHP5.6 module:
```
$ sudo a2enmod php5.6
```
Set PHP5.6 as default version:
```
$ sudo update-alternatives --set php /usr/bin/php5.6
```
Alternatively, you can run the following command to to set which system wide version of PHP you want to use by default.
```
$ sudo update-alternatives --config php
```
Enter the selection number to set it as default version or simply press ENTER to keep the current choice.
In case, you have installed other PHP extensions, set them as default as well.
```
$ sudo update-alternatives --set phar /usr/bin/phar5.6
```
Finally, restart your Apache web server:
```
$ sudo systemctl restart apache2
```
Now, check if PHP5.6 is the default version or not:
```
$ php -v
PHP 5.6.37-1+ubuntu18.04.1+deb.sury.org+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
```
#### Switch from PHP5.x to PHP7.x
Likewise, you can switch from PHP5.x to PHP7.x version as shown below.
```
$ sudo a2enmod php7.2
$ sudo a2dismod php5.6
$ sudo update-alternatives --set php /usr/bin/php7.2
$ sudo systemctl restart apache2
```
**A word of caution:**
The final stable PHP5.6 version has reached the [**end of active support**][4] as of 19 Jan 2017. However, PHP 5.6 will continue to receive support for critical security issues until 31 Dec 2018. So, It is recommended to upgrade all your PHP applications to be compatible with PHP7.x as soon as possible.
If you want prevent PHP to be automatically upgraded in future, refer the following guide.
And, that’s all for now. Hope this helps. More good stuffs to come. Stay tuned!
Cheers!
--------------------------------------------------------------------------------
via: https://www.ostechnix.com/how-to-switch-between-multiple-php-versions-in-ubuntu/
作者：[SK][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://www.ostechnix.com/author/sk/
[1]:https://www.ostechnix.com/how-to-downgrade-a-package-in-ubuntu/
[2]:https://www.ostechnix.com/downgrade-package-arch-linux/
[3]:https://www.ostechnix.com/install-apache-mariadb-php-lamp-stack-ubuntu-16-04/
[4]:http://php.net/supported-versions.php

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How the L1 Terminal Fault vulnerability affects Linux systems
======

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如何在 Ubuntu 中切换多个 PHP 版本
======
![](https://www.ostechnix.com/wp-content/uploads/2018/08/php-720x340.png)
有时，最新版本的安装包可能无法按预期工作。你的程序可能与更新的软件包不兼容，并且仅支持特定的旧版软件包。在这种情况下，你可以立即将有问题的软件包降级到其早期的工作版本。请参阅我们的旧指南，[**在这**][1]了解如何降级 Ubuntu 及其衍生版中的软件包以及[**在这**][1]了解如何降级 Arch Linux 及其衍生版中的软件包。但是，你无需降级某些软件包。我们可以同时使用多个版本。例如，假设你在测试部署在 Ubuntu 18.04 LTS 中的[**LAMP 栈**][3]的 PHP 程序。过了一段时间，你发现应用程序在 PHP5.6 中工作正常，但在 PHP 7.2 中不正常（Ubuntu 18.04 LTS 默认安装 PHP 7.x）。你打算重新安装 PHP 或整个 LAMP 栈吗？但是没有必要。你甚至不必将 PHP 降级到其早期版本。在这个简短的教程中，我将向你展示如何在 Ubuntu 18.04 LTS 中切换多个 PHP 版本。它没你想的那么难。请继续阅读。
### 在多个 PHP 版本之间切换
要查看 PHP 的默认安装版本，请运行：
```
$ php -v
PHP 7.2.7-0ubuntu0.18.04.2 (cli) (built: Jul 4 2018 16:55:24) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.7-0ubuntu0.18.04.2, Copyright (c) 1999-2018, by Zend Technologies
```
如你所见，已安装的 PHP 的版本为 7.2.7。在测试你的程序几天后，你会发现你的程序不支持 PHP7.2。在这种情况下，同时使用 PHP5.x 和 PHP7.x 是个不错的主意，这样你就可以随时轻松地在任何支持的版本之间切换。
你不必删除 PHP7.x 或重新安装 LAMP 栈。你可以同时使用 PHP5.x 和 7.x 版本。
我假设你还没有在你的系统中卸载 php5.6。万一你已将其删除，你可以使用下面的 PPA 再次安装它。
你可以从 PPA 中安装 PHP5.6：
```
$ sudo add-apt-repository -y ppa:ondrej/php
$ sudo apt update
$ sudo apt install php5.6
```
#### 从 PHP7.x 切换到 PHP5.x.
首先使用命令禁用 PHP7.2 模块：
```
$ sudo a2dismod php7.2
Module php7.2 disabled.
To activate the new configuration, you need to run:
systemctl restart apache2
```
接下来，启用 PHP5.6 模块：
```
$ sudo a2enmod php5.6
```
将 PHP5.6 设置为默认版本：
```
$ sudo update-alternatives --set php /usr/bin/php5.6
```
或者，你可以运行以下命令来设置默认情况下要使用的全局 PHP 版本。
```
$ sudo update-alternatives --config php
```
输入选择的号码将其设置为默认版本，或者只需按 ENTER 键保持当前选择。
如果你已安装其他 PHP 扩展，请将它们设置为默认值。
```
$ sudo update-alternatives --set phar /usr/bin/phar5.6
```
最后，重启 Apache Web 服务器：
```
$ sudo systemctl restart apache2
```
现在，检查 PHP5.6 是否是默认版本：
```
$ php -v
PHP 5.6.37-1+ubuntu18.04.1+deb.sury.org+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
```
#### 从 PHP5.x 切换到 PHP7.x.
同样，你可以从 PHP5.x 切换到 PHP7.x 版本，如下所示。
```
$ sudo a2enmod php7.2
$ sudo a2dismod php5.6
$ sudo update-alternatives --set php /usr/bin/php7.2
$ sudo systemctl restart apache2
```
**提醒一句：**
最终稳定版 PHP5.6 于 2017 年 1 月 19 日达到[**活跃支持截止**][4]。但是，直到 2018 年 12 月 31 日，PHP 5.6 将继续获得对关键安全问题的支持。所以，建议尽快升级所有 PHP 程序并与 PHP7.x 兼容。
如果你希望防止 PHP 将来自动升级，请参阅以下指南。
就是这些了。希望这有帮助。还有更多的好东西。敬请关注！
干杯!
--------------------------------------------------------------------------------
via: https://www.ostechnix.com/how-to-switch-between-multiple-php-versions-in-ubuntu/
作者：[SK][a]
选题：[lujun9972](https://github.com/lujun9972)
译者：[geekpi](https://github.com/geekpi)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://www.ostechnix.com/author/sk/
[1]:https://www.ostechnix.com/how-to-downgrade-a-package-in-ubuntu/
[2]:https://www.ostechnix.com/downgrade-package-arch-linux/
[3]:https://www.ostechnix.com/install-apache-mariadb-php-lamp-stack-ubuntu-16-04/
[4]:http://php.net/supported-versions.php