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**Introduction**: This guide provides step-by-step instructions on how to install Composer, a dependency management tool for PHP, on a CentOS 7 system. Composer is widely used in PHP projects to manage libraries and dependencies. **Requirements**: - A CentOS 7 server - Access to a terminal or command line - Sudo privileges or access to the root user **Step-by-Step Guide**: 1. **Update System Packages**: - Open your terminal. - Run the command `sudo yum update` to ensure all your system packages are up-to-date. 2. **Install PHP**: - Composer requires PHP to be installed on your system. Install PHP by running: ``` sudo yum install php php-cli php-zip wget unzip ``` - Once installed, verify the installation by checking the PHP version: ``` php -v ``` 3. **Download Composer**: - Use the following command to download the Composer installer: ``` php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" ``` 4. **Verify the Installer**: - To ensure the installer is safe to use, verify it with the following command: ``` php -r "if (hash_file('SHA384', 'composer-setup.php') === '') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" ``` Replace `` with the latest hash value found on the Composer Public Keys / Signatures page. 5. **Install Composer**: - Run the installer with: ``` sudo php composer-setup.php --install-dir=/usr/local/bin --filename=composer ``` - This installs Composer globally. 6. **Verify Composer Installation**: - Once the installation is complete, verify it by checking the Composer version: ``` composer --version ``` 7. **Using Composer**: - With Composer installed, you can now use it to manage dependencies in your PHP projects. For example, to start a new project, you can use: ``` composer init ``` - Follow the prompts to create a `composer.json` file for your project. **Conclusion**: Composer is now installed on your CentOS 7 system. You can use Composer to manage PHP dependencies, require libraries, and manage autoloaders in your PHP projects. **Additional Resources**: - Composer's Official Documentation: [https://getcomposer.org/doc/](https://getcomposer.org/doc/) - CentOS Official Website: [https://www.centos.org/](https://www.centos.org/)