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SOLID Principles for WordPress Development

Open/Closed Principle in WordPress

Software entities should be open for extension, but closed for modification

The Open/Closed Principle (OCP) ensures your WordPress code can grow and adapt without breaking existing functionality. Instead of modifying working code, you extend it – adding new features through hooks, filters, inheritance, or composition.

Open for Extension

Modular Plugins

Plugin Architecture

Why OCP Matters for WordPress Developers

Following the Open/Closed Principle creates WordPress themes and plugins that can grow without breaking, making your code professional and future-proof

Update Safety

Extensions survive updates because they don’t modify core code

Faster Development

Add features without touching tested code, reducing bugs

Ecosystem Growth

Others can extend your plugins without needing your permission