Chapter 4: Using the Playground

Don't have HolyPHP installed yet? No problem! You can write and run HolyPHP code directly in your browser using the HolyPHP Playground.

What is the Playground?

The HolyPHP Playground is a browser-based IDE with online code execution. It features:

• Syntax Highlighting - Beautiful code coloring for HolyPHP
• Code Editor - Full-featured editor with line numbers and brackets matching
• Online Compiler - Actually compile and run your code in a secure sandbox
• Examples Library - Learn from ready-to-run examples
• Quick Reference - Handy cheatsheets at your fingertips

Accessing the Playground

You can access the playground at:

Open HolyPHP Playground →

Playground Interface

The playground is divided into several sections:

Running Your First Program

1. Open the Playground
2. Type your code in the editor (or load an example)
3. Click the "▶ Run" button
4. See the output in the right panel

Using Examples

The sidebar has many ready-to-run examples. Click any example to load it into the editor, then click Run to see it in action.

Great examples to try first:

• Hello World - The basics
• Fibonacci - Recursion and functions
• Classes & Objects - OOP in HolyPHP
• Arrays & Maps - Working with data

Safety & Security

The playground runs your code in a secure, sandboxed environment. This means:

• Your code cannot access the filesystem outside the sandbox
• Network access is restricted
• System calls are limited
• Each execution is isolated

This is safe for learning and experimentation!

Tips for Using the Playground

• Use "✓ Check" to quickly check for syntax and type errors without running
• Use "💾 Save" to download your code as a .hphp file
• Use "📄 New" to start fresh
• Check the Quick Reference in the sidebar for syntax reminders