What are the potential pitfalls of trying to create a self-executing PHP script?

One potential pitfall of creating a self-executing PHP script is the risk of exposing sensitive information, such as database credentials or API keys, if the script is accessed directly via a URL. To prevent this, you can use a check to ensure that the script is being executed within the context of your application and not directly accessed.

// Check if the script is being accessed directly
if (basename(__FILE__) == basename($_SERVER['PHP_SELF'])) {
    // Redirect to a safe location or display an error message
    header("Location: /");
    exit;
}

// Your PHP script code here
// This code will only be executed if the script is included, not accessed directly