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check-side-effects

Analyzes PHP code for side effect issues. Detects state mutation, global access, static method calls, I/O operations mixed with business logic.

skills/check-side-effects/SKILL.md

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Aug 16, 2026
License
MIT

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# Side Effect Check

Analyze PHP code for side effects that reduce testability.

## Side Effect Types

1. **State mutation** — Changing object/array state
2. **Global access** — Reading/writing global variables
3. **I/O operations** — File, network, database
4. **Output** — echo, print, header
5. **External service calls** — API, queue, cache

## Detection Patterns