7To5 Laravel Package

Getting Started

Minimal Steps

1. Installation:

   composer require spatie/7to5 --dev
   

   Add the service provider to config/app.php under providers:

   Spatie\SevenToFive\SevenToFiveServiceProvider::class,
   

2. Basic Usage: Run the Artisan command to convert a single file:

   php artisan 7to5:convert path/to/YourClass.php
   

   Or process an entire directory recursively:

   php artisan 7to5:convert path/to/directory
   

3. First Use Case:

   • Useful for maintaining legacy PHP 5.x codebases while gradually upgrading to PHP 7+.
   • Convert a single file to verify compatibility before full migration.

Where to Look First

• Documentation: GitHub README (limited but sufficient).
• Source Code: Focus on src/SevenToFive.php for core logic and src/Commands/ConvertCommand.php for CLI behavior.
• Tests: tests/ directory for edge cases and expected outputs.

Implementation Patterns

Usage Patterns

1. Incremental Conversion:

   • Convert files one-by-one to test changes without breaking the entire codebase.
   • Use --dry-run flag to preview changes:

     php artisan 7to5:convert path/to/file --dry-run
     

2. Integration with CI/CD:

   • Add to a pre-commit hook or CI pipeline to enforce PHP 5 compatibility for legacy branches.
   • Example GitHub Actions step:

     - name: Convert PHP 7 to PHP 5
       run: php artisan 7to5:convert app/
     

3. Custom Rules:

   • Extend the converter by subclassing Spatie\SevenToFive\SevenTo5 and overriding methods like convertFile() or convertClass().
   • Example:

     class CustomSevenToFive extends SevenToFive {
         protected function convertArrowFunction($node) {
             // Custom logic for arrow functions
             return parent::convertArrowFunction($node);
         }
     }
     

4. Excluding Files/Directories:

   • Use --exclude flag to skip specific files or directories:

     php artisan 7to5:convert app/ --exclude="app/Tests/"
     

Workflows

1. Legacy Codebase Migration:

   • Step 1: Convert all files to PHP 5 syntax.
   • Step 2: Fix compilation errors manually.
   • Step 3: Gradually refactor to PHP 7+ features.

2. Vendor/Library Compatibility:

   • Convert third-party libraries (if allowed) to ensure compatibility with PHP 5.x environments.

3. Hybrid Development:

   • Maintain a branch with PHP 7+ syntax while keeping main on PHP 5.x until full migration.

Integration Tips

• Laravel Mix/Webpack: If using laravel-mix, ensure your webpack.mix.js targets PHP 5.x if needed (though this is rare).
• PHPUnit: Run tests in a PHP 5.x container (e.g., Docker) to validate converted code:

  docker run --rm -v $(pwd):/app -w /app php:5.6-cli phpunit
  

• IDE Support: Configure your IDE (e.g., PHPStorm) to parse converted files as PHP 5.x for accurate autocompletion.

Gotchas and Tips

Pitfalls

1. False Positives:

   • The converter may not handle all PHP 7+ syntax correctly (e.g., complex type hints, null coalescing).
   • Fix: Manually review converted files, especially for edge cases.

2. Backward Incompatibility:

   • Some converted code may introduce PHP 5.x-specific quirks (e.g., array() instead of []).
   • Fix: Use --overwrite cautiously and test thoroughly.

3. Performance Overhead:

   • The package is outdated (last release in 2018) and may not handle modern PHP 8+ syntax.
   • Fix: Avoid using this for PHP 7.4+ code; focus on PHP 5.6–7.3.

4. Namespace Conflicts:

   • If your code uses namespaces, ensure the converter preserves them correctly.
   • Fix: Test with a sample file first.

5. Git Conflicts:

   • Converting files in a shared repo may cause merge conflicts.
   • Fix: Coordinate with the team or use feature branches.

Debugging

1. Verbose Output: Enable debug mode to see detailed conversion steps:

   php artisan 7to5:convert path/to/file --verbose
   

2. Log File: Redirect output to a log file for large conversions:

   php artisan 7to5:convert app/ > conversion.log 2>&1
   

3. Test Cases:

   • Use the package’s tests (phpunit) to validate behavior for specific syntax:

     php artisan test --filter=SevenToFiveTest
     

Config Quirks

1. No Config File:

   • The package has no configuration file; all settings are CLI-based.
   • Workaround: Create a custom wrapper class to store settings (e.g., excluded directories).

2. Hardcoded Rules:

   • Some conversion rules (e.g., for => in arrays) are hardcoded.
   • Workaround: Extend the class to add custom rules (see "Custom Rules" above).

Extension Points

1. Custom Node Handlers: Override methods in SevenToFive to handle unsupported syntax:

   protected function convertUnsupportedNode($node) {
       // Fallback logic for unsupported features
       return $node->getCode();
   }
   

2. Pre/Post-Processing: Use Laravel’s booted event to run custom logic before/after conversion:

   SevenToFive::booted(function ($converter) {
       $converter->addCustomRule(...);
   });
   

3. Integration with Laravel Events: Trigger events after conversion to log or notify:

   event(new FileConverted($filePath, $convertedCode));
   

Pro Tips

• Backup First: Always back up files before running the converter, especially in production-like environments.
• PHP Version Testing: Use tools like PHPCompatibility to validate converted code against PHP 5.x.
• Pair with Other Tools: Combine with php-cs-fixer to standardize code after conversion:

  php artisan 7to5:convert app/ && php-cs-fixer fix app/