I discovered yesterday that there was no response when modifying the project.
Add something, delete something, and the page will remain the same.
I just found another project and tried it. When I printed something, I could see the page...
Help...

Supplementary Notes:
1. It goes without saying that finding the wrong file is such a scam...
2. It is not written in any framework, it is a foreign open source project, and a Chinese company used it to Chineseize it Down.
3. There is no cached tpl file
4. The browser cache was also deleted, to no avail
5. The environment was reinstalled, to no avail
6. Leng suddenly had an idea, thinking of this phenomenon, it was a bit It seems that there is only read permission but no write permission, but there is no prompt on the page. After checking the file permissions, it is possible to read and write.
7. I did another test in the afternoon: create a new controller and the corresponding template file in the controller. file_put_contents Just write something, it can be written...
8. Only catalog/product cannot be modified, other things such as catalog/category can be modified...It is not a permission issue. . There will be a prompt if you don’t have permission

Comprehensive explanation: Modify, add, or invalidate the original code file. To add a new file, use file_put_contents to write the file, which is effective.