While creating phpBB templates or during development it can be really irritating to delete the contents of the cache folder repeatedly after each change. For that it is better to ask phpBB to recompile the updates. For that follow these steps –
1. From admin panel choose the “General” tab
2. Choose “Load settings” from the left panel
3. Under “General options” look for “Recompile stale style components:”
4. Choose “Yes”
5. Click “Submit” and you are done. Now phpBB will recompile if there are updates.