How can server configurations impact the functionality of PHP scripts, especially related to header modification?

Server configurations can impact the functionality of PHP scripts, especially related to header modification, by restricting certain headers from being modified or sent. To ensure proper functionality, check the server's configuration settings to allow for header modification in PHP scripts. This can typically be done by adjusting the server's PHP configuration file or using PHP functions like `header()` to send headers.

<?php
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json");
// Your PHP script code here
?>