How to set up PHP version control through code

When developing PHP, we usually encounter situations where we need to use different versions of PHP. At this time, how to set up PHP version control is very important. This article explains how to set up PHP version control through code.

1. Understand PHP version control

PHP version control refers to installing multiple versions of PHP on the same server and configuring it to run in different websites or directories. This helps us debug, test and maintain different applications during project development.

2. Why PHP version control is needed

When we use different PHP versions in the development environment, we may encounter the following problems:

1. Project A PHP version 5.6 is required. Project B requires PHP version 7.2. How to set it up?
2. How to quickly switch PHP versions?
3. How to run multiple PHP versions on one server at the same time?

In this case, PHP version control comes in handy.

3. How to implement PHP version control

There are many ways to implement PHP version control, such as installing multiple PHP versions, using Docker containers, etc. This article will introduce using multiple PHP FPM pools to implement version control.

1. Install multiple PHP versions

First we need to install multiple versions of PHP. The following demonstration installs PHP 5.6, PHP 7.2, and PHP 7.3 versions.

1) Install PHP 5.6

$ sudo apt-get install php5.6-fpm

2) Install PHP 7.2

$ sudo apt-get install php7.2-fpm

3) Install PHP 7.3

$ sudo apt-get install php7.3-fpm

2. Use multiple PHP FPM pools

In order to have all PHP versions running on the same server, we need to use multiple PHP FPM pools to handle them. The following demonstrates how to configure a PHP FPM pool.

1) Create the pool configuration file

$ sudo nano /etc/php/5.6/fpm/pool.d/project-a.conf

Add in the file The following:

[project-a]
user = www-data
group = www-data
listen = /var/run/php/php5.6-fpm.sock
listen.owner = www-data
listen.group = www-data
pm = dynamic
pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3

Copy this file and create the corresponding PHP FPM pool.

$ sudo cp /etc/php/5.6/fpm/pool.d/project-a.conf /etc/php/7.2/fpm/pool.d/project-b.conf

$ sudo cp /etc/php/5.6/fpm/pool.d/project-a.conf /etc/php/7.3/fpm/pool.d/project-c.conf

2) Switch to PHP Version

Use the following command to switch PHP version:

$ sudo update-alternatives --set php /usr/bin/php5.6

$ sudo update-alternatives - -set php /usr/bin/php7.2

$ sudo update-alternatives --set php /usr/bin/php7.3

3) Reload PHP FPM

After changing the PHP version configuration, PHP FPM needs to be reloaded for it to take effect.

$ sudo service php5.6-fpm reload

$ sudo service php7.2-fpm reload

$ sudo service php7.3-fpm reload

4. Summary

Through the above steps, we can easily set up PHP version control, and can quickly switch PHP versions to meet the needs of different projects. The method introduced in this article can also be used in a production environment, and only needs to be modified and adjusted according to the actual situation.

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