Ask $_post[] Such an array variable, each different user is the same

$_post[] Such an array variable, each of the different users is the same?
For example a user to access index.php, his $_post[] array of contents, and B user to access when the $_post[] array variable contents, is not the same? Are they the same variable?

Which variables are different from each other to access the user? Which variables are shared by each user to access?

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------Solution--------------------
Isn't that the same?
Not necessarily, if there is a user input may be different
Are they the same variable?
Is

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