How can a dropdown list be automatically generated in PHP based on user selection?

To automatically generate a dropdown list in PHP based on user selection, you can use AJAX to dynamically fetch the options based on the user's choice. When the user selects an option from the first dropdown, an AJAX request is made to a PHP script that fetches the corresponding options for the second dropdown and returns them as a JSON response. The JavaScript then populates the second dropdown with the received options. 

<?php
// PHP script to fetch options based on user selection
if(isset($_POST['selectedOption'])) {
    $selectedOption = $_POST['selectedOption'];

    // Query database or any other data source to fetch options based on selectedOption
    $options = array('Option 1', 'Option 2', 'Option 3');

    echo json_encode($options);
    exit;
}
?>

Keywords

PHP dropdown list user selection dynamic generation form handling

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