How can PHP be used to send a value back to the calling page after executing functions on a remote page?

To send a value back to the calling page after executing functions on a remote page, you can use sessions or cookies to store the value on the remote page and then retrieve it on the calling page. Alternatively, you can use AJAX to make an asynchronous request to the remote page and retrieve the value.

// Remote page (remote_page.php)
session_start();
$_SESSION['value'] = "Hello from remote page!";

// Calling page
session_start();
echo $_SESSION['value'];