A plugin with its own settings page and a single text field is rendered. When a value is entered for the field and the form is submitted, `Settings saved.` is rendered. Yet a query of the database `wp_options` table shows that no value was stored for the setting; the option name `rma_base_url` exists in the table

Code:

    add_action('admin_menu', 'remote_member_auth_menu');
    
    function remote_member_auth_menu() {
        add_options_page('Remote Member Auth Options', 'Remote Member Auth', 'manage_options', 'rma', 'remote_member_auth_options');
    }
    
    function remote_member_auth_options() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.'));
        }
        echo '<div class="wrap">' .
            '<h3>Remote Member Authnetication Settings</h3>' .
            '<form method="post" action="options.php">';
        settings_fields('rma_options');
        do_settings_sections('rma');
        submit_button('Set base url');
        echo '</form>' .
            '</div>';
    }
    
    function register_rma_settings() {
        register_setting('rma_options', 'rma_base_url');
        add_settings_section('rma_main', '', 'rma_main_settings_fn', 'rma');
        add_settings_field('rma_base_url', 'Base URL', 'rma_base_url_string', 'rma', 'rma_main');
    }
    
    add_action('admin_init', 'register_rma_settings');
    
    function rma_base_url_string() {
        $options = get_option('rma_options');
        echo "<input id='rma_base_url' name='rma_options[rma_base_url]' size='40' type='text' value='{$options['rma_base_url']}' />";
    }
    
    function rma_main_settings_fn() {
        echo '';
    }