Procedure
Install PHP and Composer
Install PHP for your OS, then install Composer globally via the official installer or Windows setup exe, and verify with php and composer version commands.
Step 1
Install PHP first. macOS: brew install php . Ubuntu/Debian: apt install php php-cli unzip curl . Fedora: dnf install php php-cli unzip curl . Windows: winget install PHP.PHP or use the installer from windows.php.net
Step 2
Install Composer from https://getcomposer.org/download/ . Windows: run Composer-Setup.exe. Unix: follow the Download page installer (php -r copy installer; verify hash; php composer-setup.php), then move composer.phar onto PATH as composer (e.g. to /usr/local/bin/composer with elevated privileges if needed).
Step 3
php --version && composer --version
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