About the code of the Ucenter communication process! CSDN great Gods! Admiring! Please give me more advice!

Debugging Ucenter in the/control/admin/app.php encountered such a piece of code
if ($app [' Extra '] [' AppPath '] && @include $app [' Extra '] [' AppPath ']. /api/'. $app [' Apifilename '])
{
Code
}
Is this if the include file is the result of execution or the file itself, or simply return a ture or false?
The include comes in a. php file.
Split Line----------------------------------------------------------------------------------------------------------------
Run the Onping function in the following file

 
  Get_app_by_appid ($appid), $status = ", if ($app [' Extra '] [' AppPath '] && @include $app [' Extra '] [' AppPath ']. /api/'. $app [' Apifilename ']) {echo ' in if= '. $app [' Extra '] [' AppPath ']. /api/'. $app [' Apifilename ']; $uc _note = new Uc_note (); $status = $uc _note->test ($note [' GetData '], $note [' PostData ']) ;} else {echo ' in Else '; $this->load (' note '); $url = $_env[' Note ']->get_url_code (' Test ', ' ', $appid); $status = $_env[' App ']->test_api ($url, $IP);} if ($status = = ' 1 ') {echo ' document.getElementById (\ ' Status_ '. $appid. ' \ '). InnerHTML = "'. $this->lang[' App_connent_ok ']. '"; Testlink (); ';} else {echo ' document.getElementById (\ ' Status_ '. $appid. ' \ '). InnerHTML = "'. $this->lang[' App_connent_false ']. '"; Testlink (); ';}}? >

Include $app [' Extra '] [' AppPath ']. /api/'. $app [' apifilename '] This file is the uc.php file in the other directory, the front code is as follows! This file is UTF8 version of the HDwiki5.1 comes with!

 3600) {exit (' authracation has expiried ');}

So why did you output a ' Invalid Request? Is this the result of the output?

Reply to discussion (solution)

For @include $app [' Extra '] [' AppPath ']. /api/'. $app [' Apifilename ']
When the file $app [' Extra '] [' AppPath ']. /api/'. $app [' apifilename '] when not present, against false
Returns 1 when present
This writing is absolutely no problem!

If there is a problem with your program, please find the reason in other places

For @include $app [' Extra '] [' AppPath ']. /api/'. $app [' Apifilename ']
When the file $app [' Extra '] [' AppPath ']. /api/'. $app [' apifilename '] when not present, against false
Returns 1 when present
This writing is absolutely no problem!

If there is a problem with your program, please find the reason in other places

Excuse me, what is the difference between such usage and the function of file_exists? Does the include content affect local programs? Or is the mere interpretation of the file present?

There must be content in the include, and you can see a lot of definitions from the clips you post?
You can certainly determine the existence of a file before you include
But isn't it simple to write? At least compile the device to analyze a statement less?

Problem found.
It's a 301 jump question.
Changed the host space the original independent IP No!
301 Jump aspect may be a bit of a problem!
Thank you, great God!

