What are the limitations of using PHP within a JavaScript function without AJAX?

When using PHP within a JavaScript function without AJAX, the PHP code will not be executed on the server-side as intended. This is because JavaScript runs on the client-side, and PHP runs on the server-side. To solve this issue, you can use AJAX to make a request to a server-side PHP script, which will then execute the PHP code and return the result back to the JavaScript function. 

<?php
// server-side PHP script to handle the AJAX request
if(isset($_POST['data'])){
    // process the data sent from the client-side
    $result = $_POST['data'] * 2;
    
    // return the result back to the client-side
    echo $result;
}
?>

Keywords

PHP JavaScript AJAX cross-origin security

Related Questions