How can PHP interact with JavaScript to achieve dynamic form content based on user input?

To achieve dynamic form content based on user input, PHP can interact with JavaScript by using AJAX. When a user interacts with a form element, JavaScript can send a request to a PHP script on the server, which processes the input and returns the updated content. This allows for real-time updates without refreshing the page. 

<?php
// PHP script to handle AJAX request
if(isset($_POST['user_input'])) {
    $userInput = $_POST['user_input'];
    
    // Process user input and generate dynamic content
    $dynamicContent = "Dynamic content based on user input: " . $userInput;
    
    // Return the dynamic content as JSON
    echo json_encode(['content' => $dynamicContent]);
}
?>

Keywords

PHP JavaScript dynamic form content user input interaction

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