To install Composer on a Debian or Ubuntu Linux system, you can use the following steps:
Download the Composer installer script:curl -sS https://getcomposer.org/installer -o composer-setup.php
This downloads the Composer installer script to your current directory.
Verify the installer script integrity:php -r "if (hash_file('sha384', 'composer-setup.php') === 'e0012edf3e80b6978849f5eff0d4b4e4c79ff1609dd1e613307e16318854d24ae64f26d17af3ef0bf7cfb710ca74755a') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); }"
This checks the integrity of the installer script using a pre-computed hash value. If the hash value matches the expected value, it will display "Installer verified". If it does not match, it will display "Installer corrupt" and delete the script.
Install Composer:sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer
This installs Composer to the /usr/local/bin directory and creates a composer command-line alias.
Remove the installer script:rm composer-setup.php
This removes the installer script, which is no longer needed.
Verify the installation by running the composer --version command. This should display the version of Composer that you have installed.
Composer is a dependency manager for PHP. It allows you to define the libraries your project depends on and installs them for you. It is an essential tool for managing dependencies in PHP projects and ensuring that all required libraries are available.