How can PHP be used to dynamically update dropdown menus based on user selection?

To dynamically update dropdown menus based on user selection using PHP, you can utilize AJAX to send requests to the server and fetch updated dropdown options based on the user's selection. This can be achieved by creating a PHP script that returns the updated dropdown options based on the user's input. 

<?php
if(isset($_POST['selectedOption'])){
    $selectedOption = $_POST['selectedOption'];
    
    // Perform any necessary logic to determine the updated dropdown options based on the selected option
    // For example, you can query a database or use conditional statements
    
    // Return the updated dropdown options as JSON
    $updatedOptions = array('Option 1', 'Option 2', 'Option 3');
    echo json_encode($updatedOptions);
}
?>

Keywords

PHP dynamic dropdown menus user selection update

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