[PHP] Question about Include_once

[Al]

Does file called by "Include_once"  stay with the client's session or 
just for operations in the page where it is stated?

For example, assume I have one file that contains several functions, 
then if use "include_once('functions.php')" on several pages, does the 
server reload the file for every page, or does it know to save it for 
all pages used in the session?

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