Ultimate Guide: Fixing the PostgreSQL `could not find driver` Error in a Docker PHP Environment

Encountering the "could not find driver" error when connecting to PostgreSQL from PHP in Docker? This typically means the pdo_pgsql extension isn't properly installed or loaded. This article, based on real log analysis, guides you through diagnosing the issue step-by-step and provides the ultimate Dockerfile-based solution to ensure your development environment is stable and reproducible. Say goodbye to temporary fixes and master the correct way to build your PHP container images.