How can the PHP code be structured to prevent multiple instances of a specific file, such as home.php, from being called unnecessarily?

To prevent multiple instances of a specific file, such as home.php, from being called unnecessarily, you can use a session variable to check if the file has already been included. By setting a session variable when the file is included for the first time, you can prevent it from being included again in the same session. 

<?php
session_start();

if(!isset($_SESSION['home_included'])) {
    include 'home.php';
    $_SESSION['home_included'] = true;
}
?>

Keywords

PHP file locking singleton pattern include_once require_once

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