Why `mixed` Is the Worst Type in Your PHP Codebase (and How to Kill It)

📰 Dev.to · Gabriel Anhaia

Learn why using 'mixed' type in PHP can lead to codebase issues and how to refactor it for better code quality

intermediate Published 24 May 2026
Action Steps
  1. Identify areas in your codebase where 'mixed' type is used
  2. Analyze the five failure modes of using 'mixed' type
  3. Refactor code to use more specific types instead of 'mixed'
  4. Use PHPStan to detect and report 'mixed' type usage
  5. Implement a migration path to remove 'mixed' type from your codebase
Who Needs to Know This

Developers and development teams can benefit from understanding the pitfalls of using 'mixed' type in their PHP codebase and learn how to improve code quality and maintainability

Key Insight

💡 Using 'mixed' type in PHP can lead to code quality issues and make maintenance harder, refactor to specific types for better code

Share This
🚨 'mixed' type in PHP can lead to codebase issues! Learn how to identify, refactor, and migrate away from it 🚀

Key Takeaways

Learn why using 'mixed' type in PHP can lead to codebase issues and how to refactor it for better code quality

Full Article

mixed is the type Laravel docs use, PHPStan tolerates, and your codebase quietly accumulates. Five failure modes and the migration path.
Read full article → ← Back to Reads

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