How can PHP be utilized to dynamically update form input values based on user input?

When a user inputs data into a form field, PHP can be used to dynamically update other form input values based on that input. This can be achieved by using JavaScript to capture the user input and send it to a PHP script for processing. The PHP script can then calculate or retrieve relevant data based on the user input and send it back to the form to update the desired input fields. 

<?php
if(isset($_POST['user_input'])){
    $user_input = $_POST['user_input'];
    
    // Perform calculations or retrieve data based on user input
    $updated_value = $user_input * 2;
    
    // Send updated value back to the form
    echo json_encode(['updated_value' => $updated_value]);
}
?>

Keywords

PHP form input dynamic update user input values

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