Laravel Opcache Laravel Package

Getting Started

Minimal Steps

1. Installation:

   composer require appstract/laravel-opcache
   

   Publish the config (optional, for customization):

   php artisan vendor:publish --provider="Appstract\Opcache\OpcacheServiceProvider" --tag="config"
   

2. First Use Case: Run the opcache:status command to verify OPcache is active and check current stats:

   php artisan opcache:status
   

   This provides immediate visibility into OPcache’s memory usage, hit/miss ratios, and script coverage.

Where to Look First

• Artisan Commands: The package adds three core commands (opcache:clear, opcache:config, opcache:status) under the php artisan opcache: namespace.
• Config File: Located at config/opcache.php (if published). Key settings include:
  • url: Override the default route URL (e.g., for load balancers).
  • php.ini_path: Specify a custom php.ini path if OPcache is configured non-standardly.

Implementation Patterns

Usage Patterns

1. Post-Deployment Workflow:

   • After deploying code changes, run:

     php artisan opcache:clear
     

     This ensures stale OPcache entries are purged, preventing cached old code from executing.
   • Pro Tip: Add this to your deployment script (e.g., deploy.php or Makefile) as a post-hook.

2. Monitoring OPcache Performance:

   • Schedule opcache:status in a cron job or CI pipeline to track:
     • memory_consumption: Detect memory bloat.
     • hit_rate: Identify underperforming scripts (aim for >90%).
   • Example cron entry (run daily):

     0 3 * * * cd /path/to/project && php artisan opcache:status >> /var/log/opcache_metrics.log
     

3. Debugging Stale Caches:

   • Use opcache:config to verify settings like opcache.revalidate_freq (default: 2 seconds) align with your deployment frequency.
   • For long-running processes (e.g., queues), set opcache.max_accelerated_files higher to avoid cache eviction.

Integration Tips

• Laravel Forge/Cpanel: Add the opcache:clear command to your post-deploy hooks via the "Run custom commands" field.
• CI/CD Pipelines: Include php artisan opcache:clear in your test suite’s after_script to simulate a clean environment:

  # .github/workflows/test.yml
  jobs:
    test:
      runs-on: ubuntu-latest
      steps:
        - run: php artisan opcache:clear
  

• Custom Routes: If using OPCACHE_URL, ensure your load balancer forwards requests to the correct backend (e.g., OPCACHE_URL=/opcache).

Gotchas and Tips

Pitfalls

1. False Positives in opcache:status:

   • The script_name field may show unknown if OPcache is compiled as a ZTS (Thread-Safe) module. Ignore this unless scripts are missing entirely.
   • Fix: Rebuild PHP with --enable-opcache and --disable-zts if needed.

2. Permission Issues:

   • opcache:clear may fail if PHP-FPM’s user (e.g., www-data) lacks write access to OPcache’s storage.
   • Fix: Set opcache.file_cache to a writable directory (e.g., /dev/shm/opcache) in php.ini or adjust permissions:

     sudo chown -R www-data:www-data /path/to/opcache/storage
     

3. Laravel Queue Workers:

   • Workers may continue using stale OPcache entries after opcache:clear. Restart workers post-clear:

     php artisan queue:restart
     

Debugging

• Check OPcache Logs: Enable opcache.log_verbosity_level in php.ini (e.g., 1 for errors) and monitor /var/log/php_opcache.log.
• Validate Config: Run php artisan opcache:config and cross-reference with php -i | grep opcache to spot discrepancies.

Extension Points

1. Custom Commands: Extend the package by creating a new Artisan command that uses the underlying OpcacheManager service:

   use Appstract\Opcache\OpcacheManager;
   
   class CustomOpcacheCommand extends Command {
       protected $opcache;
   
       public function __construct(OpcacheManager $opcache) {
           $this->opcache = $opcache;
           parent::__construct();
       }
   
       public function handle() {
           $stats = $this->opcache->getStatus();
           // Custom logic (e.g., alert if hit_rate < 80%)
       }
   }
   

   Register it in AppServiceProvider@boot():

   $this->commands([CustomOpcacheCommand::class]);
   

2. Event Listeners: Trigger OPcache clearing on specific events (e.g., Deployed):

   use Appstract\Opcache\Facades\Opcache;
   
   event(new Deployed($release));
   Opcache::clear();
   

3. Middleware: Add OPcache headers to responses for debugging:

   public function handle($request, Closure $next) {
       $response = $next($request);
       $response->header('X-Opcache-Status', Opcache::getStatus()['status']);
       return $response;
   }