my checkbox is not saving it's value

Question

Processing the following form in the admin area, but the database constantly returning an empty cell where the info should be. Help!!

<form action="options.php" method="post">

            <input type="hidden" value="admin_bar" name="option_page"><input type="hidden" value="update" name="action"><input type="hidden" value="fd5754f034" name="_wpnonce" id="_wpnonce"><input type="hidden" value="/accessibilitysite/wp-admin/options-general.php?page=admin_bar&amp;settings-updated=true" name="_wp_http_referer">


            <table class="form-table">


        <tbody><tr valign="top"><th scope="row">Admin Toggle</th>
                                <td><input type="checkbox" value="admin_bar_toggle" name="admin_bar_[admin_bar_toggle]"><p>Turn Admin Bar On ?</p></td>

        </tr>   

            </tbody></table>

            <p class="submit">

            <input type="submit" value="Save Changes" class="button-primary">

            </p>

        </form>

Answer 1

options.php does not automatically save in the database anything that you post to it. You must also tell the page which options it should look for in the posted data.

I see that you have set option_page to admin_bar, which is half of the solution. The other half is to add the option names to the whitelist. You are using the form element name admin_bar_[admin_bar_toggle] which will show up as $_POST['admin_bar_']['admin_bar_toggle'] when the form is submitted with that box checked. This filter should tell options.php that you want this option saved:

function admin_page_whitelist_options( $whitelist_options ) {
    $whitelist_options['admin_bar'] = array( 'admin_bar_' );
    return $whitelist_options;
}
add_filter( 'whitelist_options', 'admin_page_whitelist_options' );

After that, you should find what you are looking for in the option named admin_bar_.