PDO (PHP Data Objects) - allows developers to interact with various database management systems such as MySQL, PostgreSQL, and Oracle.
cURL - enables communication with other servers using various protocols such as HTTP, HTTPS, FTP, and more.
mbstring - provides support for multibyte strings, which allows for the manipulation of text encoded in different character sets.
gd - enables the creation and manipulation of images, including JPEG, PNG, and GIF formats.
openssl - provides support for secure socket layer (SSL) and transport layer security (TLS) protocols, which are commonly used for secure communication over the internet.
xdebug - a powerful debugging and profiling tool for PHP, it allows developers to identify and fix errors in their code more easily
intl - enables internationalization support for PHP, which provides functions for working with different languages and character sets.
Keep in mind that the popular extensions used can vary depending on the project, server or framework you are using.
To install PHP extensions on a Linux server, you can use the command line. The process typically involves the following steps:
sudo apt-get install -y libssl-dev libcurl4-openssl-dev
sudo apt-get install -y php-curl
sudo service apache2 restart
Note: This is a general guideline, the commands may vary depending on the Linux distribution, version and PHP version you're using.
Also, it's important to note that, some extensions are already built-in in the PHP package and you don't need to install them separately, you just need to enable them.
You should check the PHP version you're using and the package manager you have in your Linux distribution to have the correct commands.