Extremely defensive PHP
summary
Argues for concrete rules: no setters and constructor injection so optional dependencies disappear and tests stub fakes or null objects; prefer value objects over mixed types and assert external input early; make properties private and classes final by default; clone defensively or disable cloning and disallow serialization of nonserializable resources; aim for branch coverage (example login path requires five tests: true false plus three exception cases) and reduce public API surface to avoid brittle, time‑coupled operations.
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