Fix: Prevent autoloading non class-like files during discovery to avoid "FatalError: Cannot redeclare function"

[zdearo]

Description Summary

• This PR resolves some points discussed in Cannot install, duplicate function declaration #67
• Add a lightweight guard (fileHasClassLike) before calling class_exists during app discovery.
• Skip files that do not contain a class/interface/trait/enum to prevent unintended autoloading of helpers or function-only files.

Motivation

• class_exists triggered Composer’s autoload for helper files that only declare functions, which could lead to double-inclusion and a Fatal error: Cannot redeclare function.
• Discovery only needs class-like types (Models, Controllers, Enums), so loading helpers is unnecessary and risky.

Changes

• Introduce fileHasClassLike($path) with:

  • static in-memory cache per path;
  • cheap keyword pre-check to avoid tokenization when possible;
  • token-based detection (T_CLASS, T_INTERFACE, T_TRAIT, T_ENUM) to avoid false positives.

• Use this guard in the discovery loop to skip non class-like files before invoking class_exists.

Fixes #67

[ashleyhindle]

Wonderful, thanks for finding & fixing this @zdearo, super helpful! 🫶