What potential issues can arise from running the script multiple times on the same page load?

Potential issues that can arise from running the script multiple times on the same page load include duplicate data being processed or displayed, increased server load leading to performance issues, and unintended side effects due to repeated execution of the same logic. To solve this issue, you can use a flag or a session variable to check if the script has already been executed on the current page load before running it again. 

<?php
session_start();

if (!isset($_SESSION['script_executed'])) {
    // Run your script logic here

    // Set flag to indicate script has been executed
    $_SESSION['script_executed'] = true;
}
?>

Keywords

concurrency race condition session variables database locks resource exhaustion

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