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PHP Online Compiler

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Free PHP Online Compiler & Code Runner

MasterPHP's PHP online compiler lets you write, run, and debug PHP code directly in your browser — no installation, no setup, no account required. Whether you're a beginner learning PHP syntax or an experienced developer quickly testing a snippet, this free PHP code runner is built for you. It supports multi-file projects, custom functions, arrays, loops, and all core PHP features.

Sandbox Security & Execution Limits

PHP Basics You Can Run Online

  • Echo & Output: Use echo or print to send output to the console.
  • Variables & Types: PHP is loosely typed. Variables start with a $ sign (e.g., $name = "MasterPHP";).
  • Control Structures: Standard constructs like if/else, while, and foreach loops are fully supported.
  • Functions & Arrays: Define custom functions and use PHP's robust array and string manipulation libraries.

Environment Limits

  • Execution Timeout: Hard-capped at 5 seconds to prevent infinite loops.
  • Memory Limit: 64 MB maximum RAM per execution.
  • File Space: Max 20 files, up to 512 KB per virtual file.
  • Console Output: Truncated at ~100 KB to prevent browser freezing.
Execution Environment & Security

To keep this PHP compiler free and safe for everyone, your code runs inside an isolated server sandbox. System-level permissions, network calls, and resource-intensive operations are disabled to prevent abuse and ensure stability for all users.

Notice a vulnerability? If you find a critical flaw or manage to bypass our sandbox, please responsibly report it to support@masterphp.in.

How to Use the PHP Online Compiler

  1. Write your PHP code in the editor on the left. The default file is index.php.
  2. Click Run Code (or press the play button) to execute your script.
  3. Output and errors appear instantly in the right-hand panel.
  4. Need multiple files? Click the + icon in the Explorer to add more .php files and use require to link them.
  5. Download your entire project as a ZIP file anytime using the Download ZIP button.

Frequently Asked Questions

Is MasterPHP's PHP online compiler free?

Yes, completely free. No account, no credit card, and no installation required. Just open the page and start coding.

Does the compiler support multiple PHP files?

Yes. You can create up to 20 virtual files per project (max 512 KB each) and use require or include to link them — just like a real PHP project.

What PHP version does this online compiler use?

The compiler runs on a modern PHP version hosted on our sandboxed server. Check the exact version by running echo phpversion(); in your code.

Is the PHP code I run secure and private?

All code executes inside an isolated sandbox. System-level permissions, network access, and resource-heavy operations are disabled. Avoid submitting sensitive personal data in your code.