Including files and what file they execute against

Hi nice people hope u are all well :>)
Guys hopefully an easy one.

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Scenario
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Page 1:
menu5_it_scripting_perl_variables_imageskb.php
        <?php include ("includes/specific_includes/images_pages/previewarea_and_carousel.php"); ?>

Page 2:
includes/specific_includes/images_pages/previewarea_and_carousel.php

<?php
$current_loaded_page = basename(__FILE__);                      
$get_correct_folder = explode('_',$current_loaded_page);      
$lose_first_element = array_shift($get_correct_folder);        
$get_correct_folder = implode('/',$get_correct_folder);        
$get_correct_folder = substr($get_correct_folder, 0, -4);      
echo "The value of \$get_correct_folder is: " . $get_correct_folder . "\n";
?>

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Problem i have:
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When i load up page1 (eg.menu5_it_scripting_perl_variables_imageskb.php), and see the value of:
echo "The value of \$get_correct_folder is: " . $get_correct_folder . "\n";
it returns the value for being run against page 2, when what I want is all that code ive pasted above to actually run against page 1.

I know I can just "include" directly into the page1 page (menu5_it_scripting_perl_variables_imageskb.php) this code, but that means i will have to do this for a lot of pages.

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Question:
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Is there any way to "include" a reference to a file with the code i have above into page1 (without having to directly place the code in this file), and have that file execute against page1?
Is this where I have to turn the above code into a function, and then call it from within page1?

Any help greatly appreciated.


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