How to change the php version of lamp

LAMP refers to the integration of four technologies: Linux, Apache, MySQL, and PHP. Among them, PHP is a programming language used for writing web applications. In the LAMP architecture, PHP is used as a server-side scripting language and is responsible for generating dynamic web content. For LAMP users, they often encounter situations where they need to change the PHP version. This article will briefly explain how to change PHP version on LAMP server.

Step 1: Check the current PHP version

Before changing the PHP version, we need to first determine the PHP version installed on the current server. We can check the current PHP version through the following command:

php -v

This command will output the current PHP version information. For example, we may get the following results:

PHP 7.2.24-0ubuntu0.18.04.6 (cli) (built: May 26 2020 13:09:11) ( NTS )

In this example, the current PHP version is 7.2.24.

Step 2: Install the new PHP version

The PHP version on the LAMP server is usually installed and updated through the package manager. In the Ubuntu operating system, we can use the apt-get package manager to install software packages. We can use the following command to view the currently available PHP versions:

apt-cache search php-

This will list the currently available PHP versions. For example, we may see the following:

php7.0 - server-side, HTML-embedded scripting language (metapackage)
php7.0-amqp - AMQP extension for PHP
php7.0-bcmath - Bcmath module for PHP
php7.0-bz2 - bzip2 module for PHP
...

We can choose the version that suits us for installation. For example, in Ubuntu 18.04, the command to install PHP 7.3 and PHP 7.4 at the same time is:

sudo apt-get install php7.3 php7.3-cli php7.3-common php7.3-json php7.3-opcache php7.3-readline php7.4 php7.4-cli php7.4-common php7.4-json php7.4-opcache php7.4-readline libapache2-mod-php7.3 libapache2-mod-php7.4

We also need to update the configuration of the Apache server so that it can load the new PHP version. In the Ubuntu system, you can use the following command to make the new version of PHP the default version of the Apache server:

sudo a2enmod php7.x

Here, x represents the major version number of the new PHP version, such as 7.3 or 7.4.

Step 3: Restart the Apache server

After installing the new PHP version and updating the Apache configuration, we need to restart the Apache server for the changes to take effect. In Ubuntu system, you can restart Apache with the following command:

sudo systemctl restart apache2

After restarting, you can use the new PHP version.

Conclusion

The above is how to change the PHP version on the LAMP server. It should be noted that before changing the PHP version, you should back up the data to prevent unpredictable problems caused by updating the PHP version. During operation, attention should be paid to following security best practices to prevent the introduction of security risks during operation.

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