What are the key differences between client-side JavaScript and server-side PHP that need to be considered when passing data between the two languages?

When passing data between client-side JavaScript and server-side PHP, the key differences to consider are the fact that JavaScript runs on the client's browser, while PHP runs on the server. This means that data passed from JavaScript to PHP needs to be sent via HTTP requests, typically using AJAX. Additionally, data passed from PHP to JavaScript can be done by echoing the data in the PHP script and then accessing it in the JavaScript code. 

// PHP code to receive data from client-side JavaScript
$data_from_js = $_POST['data'];
echo json_encode($data_from_js);

Keywords

Client-side JavaScript server-side PHP data passing AJAX JSON.

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