What are some common pitfalls or challenges when using PHP and JavaScript together on a website?

One common challenge when using PHP and JavaScript together is passing data between the two languages. This can be solved by using AJAX to send data from JavaScript to a PHP script on the server, which can then process the data and send a response back to the client. 

// PHP script to receive data from JavaScript using AJAX
$data = $_POST['data']; // Retrieve data sent from JavaScript
// Process the data
// Send a response back to the client

Keywords

PHP JavaScript interoperability AJAX cross-origin requests

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