How to Debug php programs?

How to Debug php programs? After a request is sent, the browser cannot accept the returned data and is in the padding state. after a breakpoint is added to the code, the request is still normal only after Apache and MySQL are restarted. However, the second request does not respond.

Reply to discussion (solution)

Check the apache error log.

Debug it with fiddler.

Or right-click in Google's browser and select review elements. then the following page appears. you can view it directly.

I don't know if this meets your needs.

It should be because the program has a problem, but I don't know how to locate the problem.

Or right-click in Google's browser and select review elements. then the following page appears. you can view it directly.

I don't know if this meets your needs.

This cannot be used. the browser is always switching and the content is not visible in the network.

You must restart the web service.

Apparently, your program has an endless loop!
Paste the program to see it

Or right-click in Google's browser and select review elements. then the following page appears. you can view it directly.

I don't know if this meets your needs.

This cannot be used. the browser is always switching and the content is not visible in the network.

Ah? No! Paste the code to me!

It seems that your program has an endless loop. Shorten the running time to see if it will be solved. If yes, check the loop section.
Use set_time_limit (); to set the time allowed for script running, in seconds. If this setting is exceeded, the script returns a fatal error. The default value is 30 seconds.
Set_time_limit (1); // Set to 1 second timeout