Building Resilient PHP Applications with Exception Hierarchies

This tutorial walks through PHP exception handling by building a CSV data import service that reads partner inventory feeds, validates rows, calls an enrichment API, and writes to a database. It covers the exception class hierarchy, custom exception types extending RuntimeException and LogicException, multiple catch blocks ordered most-specific to least-specific, finally for resource cleanup, exception chaining with the $previous parameter, and setexceptionhandler for top-level recovery.