How can a dynamic dropdown feature be implemented in PHP without submitting a form?

When implementing a dynamic dropdown feature in PHP without submitting a form, you can use JavaScript to make an AJAX request to a PHP script that fetches the data for the dropdown options. This way, the dropdown can be updated without refreshing the page. 

// PHP script to fetch dropdown options based on user input
<?php
// Connect to database or fetch data from an external source
// For example, fetching data from a database
$selectedValue = $_GET['selectedValue'];

// Query to fetch dropdown options based on selected value
// Example query: SELECT option_value FROM options_table WHERE condition = $selectedValue

// Fetch and output dropdown options
$options = ['Option 1', 'Option 2', 'Option 3']; // Replace with fetched data
foreach($options as $option) {
    echo '<option value="' . $option . '">' . $option . '</option>';
}
?>

Keywords

PHP dynamic dropdown AJAX JSON onchange event

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