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find-boundary-issues

Detects boundary issues in PHP code. Finds array index out of bounds, empty collection access, off-by-one errors, integer overflow, string length issues.

skills/find-boundary-issues/SKILL.md

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# Boundary Issue Detection

Analyze PHP code for boundary and range violations.

## Detection Patterns

### 1. Array Index Out of Bounds

```php
// BUG: No bounds check
$items = [1, 2, 3];
$last = $items[count($items)]; // Off by one, should be count - 1

// BUG: Hardcoded index
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