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check-pure-functions

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Analyzes PHP code for pure function patterns. Detects side-effect-free methods, deterministic output, immutable inputs. Pure functions are easily testable.

skills/check-pure-functions/SKILL.md

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# Pure Function Check

Analyze PHP code for pure function patterns that improve testability.

## Pure Function Characteristics

A **pure function**:
1. Returns the same output for the same input (deterministic)
2. Has no side effects
3. Doesn't depend on external state

## Detection Patterns

### 1. Non-Deterministic Methods
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