Thinkphp's app_debug brought me problems.

1. Just started to learn thinkphp, after the module group, after their own configuration module group, found that the page is not open, group configuration

2. Problem phenomena

Functions that are written when working with empty modules also cannot be run

At this time I was very confused, have been checking their spelling and configuration did not find errors

3. Then I go from the back to the first to remove the call to view, the direct output of the word

Words still can't be lost

4. Then I fall back to no module, single file

Results can be displayed

Here I conclude that the module grouping configuration does not produce an effect

5. Then I find in this section, found grammar or something is right, I look at the import file, compare reference, found that the debug mode is not turned on, so open

Everything's all right.

10. I opened the document and looked at the relevant knowledge

Thinkphp's app_debug brought me problems.