How can PHP be used to process and manipulate user input received from JavaScript?

When receiving user input from JavaScript, PHP can be used to process and manipulate this data by using AJAX to send the input to a PHP script on the server. The PHP script can then perform any necessary validation, sanitization, or manipulation of the input before sending a response back to the client-side JavaScript. 

<?php
// Retrieve user input from the AJAX request
$user_input = $_POST['user_input'];

// Process and manipulate the user input
$processed_input = strtoupper($user_input);

// Send the processed input back to the client-side JavaScript
echo json_encode(['processed_input' => $processed_input]);
?>

Keywords

PHP user input JavaScript processing manipulation

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