How does this variable come from?

How does this variable come from if (isset ($ _ GET ['n' _ page]) in the following code) {// judge the current page number
Of N_pageWhere did it come from? I checked out how it was not a field in a data table. Is it a casual definition?

 
 
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Department name
 
    
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Recorder
 
    
Meeting Summary
 
    
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Current is AbsolutePage ();?> Page/total LastPageNo ();?> Page AtfirstPage () {// if the current page is not the homepage?> "> Homepage absolutePage ()-1);?> "> Previous Page  AtlastPage () {// if the current page is not the last page?> AbsolutePage () + 1);?> "> Next Page: LastPageNo ();?> "> Last Page    
 
    
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Reply to discussion (solution)

Check the value in the session and which page is passed in.

This should be the page number parameter, similar to this
Http://index.php? N_page = 2, 3, 4 ......
When n_page is the first page, the parameter is usually not obtained. Therefore, you need to determine whether $ _ GET ['n' _ page] exists. if it does not exist, it is the first page. If yes, the corresponding page content is displayed based on the obtained value.

Do you have such a statement?
"> Homepage
$ _ GET ['n' _ page '].

What is the value passed through the page link?
$ _ GET value. if the value is not obtained, the default value is the first page.
There are all the pages behind you.

It is actually from the "> homepage
This involves url-based value passing. when a link is uploaded to the address bar, the $ _ GET [] array intercepts it, because the $ _ GET [] array is a global variable array, intercepted values in the address bar.
Unfortunately, no one answered correctly.