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check-type-juggling

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Detects PHP type juggling vulnerabilities. Identifies loose comparison with user input, in_array without strict mode, switch statement type coercion, and hash comparison bypasses.

skills/check-type-juggling/SKILL.md

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# Type Juggling Security Check (A03:2021)

Analyze PHP code for type juggling vulnerabilities exploiting PHP's loose comparison behavior.

**PHP version baseline: 8.4.** PHP 8.0 changed number-to-string comparison
([Saner string to number comparisons](https://wiki.php.net/rfc/string_to_number_comparison)):
an int compared with a *non-numeric* string is now compared **as a string**, so `0 == 'admin'`
is `false`. Do not report the pre-8.0 bypass. What survives is listed below — bools, numeric
strings, `null`, and `false`-returning functions.

## Detection Patterns

### 1. Loose Comparison with User Input
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