Wordpress: добавления глобальных переменных (настроек)

/**
 *
 * The page content surrounding the settings fields. Usually you use this to instruct non-techy people what to do.
 *
 */
function custom_settings_page(){
    ?>
    <div class="wrap">
        <h1>Custom settings</h1>
        <p>This information is used on page "Home".</p>
        <form method="post" action="options.php">
            <?php
            settings_fields("home_section");
            settings_fields("cross_section");
            do_settings_sections("custom-options");
            submit_button();
            ?>
        </form>
    </div>
<?php }

function display_home_left_title_element(){ ?>
    <input type="text" name="home_left_title" placeholder="Enter left title" value="<?php echo get_option('home_left_title'); ?>" size="35">
<?php }

/**
 * Here you tell WP what to enqueue into the <form> area. You need:
 * 1. add_settings_section
 * 2. add_settings_field
 * 3. register_setting
 */

function display_custom_info_fields(){

    add_settings_section("home_section", "Home page", null, "custom-options");

    add_settings_field("home_left_title", "Left title", "display_home_left_title_element", "custom-options", "home_section");

    register_setting("home_section", "home_left_title");
}

add_action("admin_init", "display_custom_info_fields");

/**
 * Tie it all together by adding the settings page to wherever you like. For this example it will appear
 * in Settings > Contact Info
 */
function add_custom_info_menu_item(){
    add_menu_page("Custom settings", "Custom settings", "manage_options", "custom-settings", "custom_settings_page");
//    add_submenu_page("custom-settings", "Home page", "Home page", "manage_options", "custom-settings-home", "custom_settings_page");
}

add_action("admin_menu", "add_custom_info_menu_item");