Does php support global variables? How can this problem be solved?

Does php support global variables? Can you define a global variable, assign it different values on different pages, and then call it. & Nbsp; for example, define var = 0 in. & nbsp; var = 1; & nbsp; includec. php in B. & nbsp; var = 2; & nbsp; Dec. php in c. does p php support global variables?
Can you define a global variable, assign it different values on different pages, and then call it.

For example, define var = 0
In a. php
Var = 1;
Include c. php
In B. php
Var = 2;
Include c. php
Judge in c. php
If (var = 1)
Include c1.php
If (var = 2)
Include c2.php
Else
...

I tried to write it like this. it seems no.
You can write this variable into the session.

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No. PHP does not have global variables. it can be stored and read in a database or file.
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There are global variables
For example
$ Var = 0; written in config. php

In c. php, include_once ('config. php ');
Then you can use the $ var variable.

However, if you want to use $ var in the function
Add global $ var;
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Discussion

There are global variables
For example
$ Var = 0; written in config. php

In c. php, include_once ('config. php ');
Then you can use the $ var variable.

However, if you want to use $ var in the function
Add global $ var;

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There are many. Session is one of them.
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Text games?
Global
All variables other than functions and classes are global variables.

Leave a variable that exists independently in the php program. php is called a system variable. Read-only

$ _ GET, $ _ POST, and $ _ SESSION are super global variables.

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The session in php can be used to set global variables, store the values in them, and the values are valid until you delete them (cookie has similar practices)
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It is defined in a public file and then included in all files. this variable is a global variable...

Sessions, databases, and hidden domain values can also be global variables.
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Of course.
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Saving variables to the object is similar to the php Singleton mode. isn't that all right? We can change the value or call it globally.
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Discussion

Text games?
Global
All variables other than functions and classes are global variables.

Leave a variable that exists independently in the php program. php is called a system variable. Read-only

$ _ GET, $ _ POST, and $ _ SESSION are super global variables.