How can the autocomplete feature be improved to display both the last name and first name in the input field?

The autocomplete feature can be improved to display both the last name and first name in the input field by modifying the data structure returned by the autocomplete function. Instead of just returning the last name or first name, the autocomplete function should concatenate the last name and first name with a space in between. This way, when the user selects a suggestion from the autocomplete list, both the last name and first name will be displayed in the input field.

// Sample autocomplete function that returns last name and first name concatenated
function autocomplete($query) {
    // Perform database query to retrieve last name and first name based on the query
    $results = // Database query results
    
    $suggestions = array();
    
    foreach ($results as $result) {
        $suggestions[] = $result['last_name'] . ' ' . $result['first_name'];
    }
    
    return $suggestions;
}