Output from plugin to appear on specific pages with WordPress - php

Question

I am currently trying to do research on how to output a result from a WordPress custom plugin to the frontend of WordPress. I have trying adding filters, do actions, add actions. But nothing seems to work. I know the add_action works for child themes because I'm currently using a script to do so.
The script below works for the child theme but not in a plugins functions.php page.
function displayPages()
{
$pageIDs = "List of page ids";
if(is_page($pageIDs))
{
include_once 'script.js';
}
}
add_action('wp_footer', 'displayPages')
Here is the current code I was trying use to fix the problem with the plugin.
function getPageIDs()
{
include_once($_SERVER['DOCUMENT_ROOT'].'/stage/wp-config.php' );
global $wpdb;
$row = $wpdb->get_row( 'SELECT pages FROM schemalocalbusiness WHERE id = 1');
$pageIDs = $row->pages;
$pageIDsArray = explode(",", $pageIDs);
foreach($pageIDsArray as $perma)
{
echo ' ' . esc_url( get_permalink($perma) ) . '<br>';
}
}
function includeShemaOnPage()
{
$actual_link = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
if(getPageID() == $acturla_link)
{
print 'SUCCESS';
}
}
add_action('wp_footer', 'includeShemaOnPage');
Any and all help would be much appreciated! Thank you in advance!