How do I implement blue/green deployments for SSH best practices?

        # Step 1: Prepare Blue and Green Environments
        $blue_server = 'your-blue-server-ip';
        $green_server = 'your-green-server-ip';

        # Step 2: Deploy to the Green Environment
        ssh user@$green_server "git pull origin main && composer install && php artisan migrate";

        # Step 3: Run tests on Green Server
        ssh user@$green_server "php artisan test";

        # Step 4: Switch Traffic
        # If tests pass, update the load balancer or DNS to point to the Green server
        update_load_balancer($green_server);

        # Function to update load balancer (hypothetical)
        function update_load_balancer($server) {
            // Logic to switch traffic goes here
            echo "Traffic switched to: " . $server;
        }
        
        # Step 5: Monitor the Green Server
        monitor_server($green_server);

        # Function to monitor server
        function monitor_server($server) {
            // Implement monitoring logic
            echo "Monitoring server: " . $server;
        }

        # Step 6: Rollback if necessary
        # If there are issues, revert traffic back to the Blue environment
        revert_traffic($blue_server);

        # Function to revert traffic
        function revert_traffic($server) {
            // Logic to switch traffic back to the Blue server
            echo "Traffic reverted to: " . $server;
        }