Register additional Wordpress options in admin

header.php

<?php $myopts = get_option( 'my_option_name', '' ); ?>
<div class="slogan" title="<?php echo $myopts['slogan_translate']; ?>">

register_options_page.php

<?php
//from http://codex.wordpress.org/Creating_Options_Pages#Example_.232
//Don't forget to include this file in functions.php: require_once( 'external/register_options_page.php' );
//Search for EDIT to add new options
class MySettingsPage
{
	/**
	 * Holds the values to be used in the fields callbacks
	 */
	public $sectionname = 'Настройки сайта';
	public $sectionname_menu = 'Дополнительные настройки сайта';
	public $sectionsubhead = 'Дополнительные настройки сайта';
	// public $sectionintrotext = $sectionname.' &laquo;'.get_bloginfo( 'name' ).'&raquo;'; //Referring to another variable doesn't work
	public $db_options_id = 'my_option_name';




	private $options;

	/**
	 * Start up
	 */
	public function __construct()
	{
		add_action( 'admin_menu', array( $this, 'add_plugin_page' ) );
		add_action( 'admin_init', array( $this, 'page_init' ) );
	}

	/**
	 * Add options page
	 */
	public function add_plugin_page()
	{
		// This page will be under "Settings"
		add_options_page(
			$this->sectionname, //The text for <title> tags
			$this->sectionname_menu, //The text to be used for the menu 
			'manage_options', //capability
			'my-setting-admin', //menu slug
			array( $this, 'create_admin_page' )
		);
	}

	/**
	 * Options page callback
	 */
	public function create_admin_page()
	{
		// Set class property
		$this->options = get_option( $this->db_options_id );
		?>
		<div class="wrap">
			<h2><?php echo $this->sectionname; ?></h2>
			<form method="post" action="options.php">
			<?php
				// This prints out all hidden setting fields
				settings_fields( 'my_option_group' );
				do_settings_sections( 'my-setting-admin' );
				submit_button(); 
			?>
			</form>
		</div>
		<?php
	}

	/**
	 * Register and add settings
	 */
	public function page_init()
	{        
		register_setting(
			'my_option_group', // Option group
			$this->db_options_id, // Option name
			array( $this, 'sanitize' ) // Sanitize
		);

		add_settings_section(
			'setting_section_id', // ID
			$this->sectionsubhead, // Title
			array( $this, 'print_section_info' ), // Callback
			'my-setting-admin' // Page
		);




		// EDIT 1
		add_settings_field(
			'slogan', 
			'Слоган', 
			array( $this, 'slogan_callback' ), 
			'my-setting-admin', 
			'setting_section_id'
		);
		add_settings_field(
			'slogan_translate', 
			'Перевод слогана', 
			array( $this, 'slogan_translate_callback' ), 
			'my-setting-admin', 
			'setting_section_id'
		);
	}

	/**
	 * Sanitize each setting field as needed
	 *
	 * @param array $input Contains all settings fields as array keys
	 */
	public function sanitize( $input )
	{
		$new_input = array();
	



		//EDIT 2
		if( isset( $input['slogan'] ) )
			$new_input['slogan'] = sanitize_text_field( $input['slogan'] );
		if( isset( $input['slogan_translate'] ) )
			$new_input['slogan_translate'] = sanitize_text_field( $input['slogan_translate'] );





		return $new_input;
	}

	/** 
	 * Print the Section text
	 */
	public function print_section_info()
	{
		// echo $this->sectionintrotext;
		echo $this->sectionname.' &laquo;'.get_bloginfo( 'name' ).'&raquo;';
	}




	//EDIT 3
	/** 
	 * Get the settings option array and print one of its values
	 */
	public function slogan_callback()
	{
		printf(
			'<input type="text" id="slogan" name="my_option_name[slogan]" value="%s" style="width:300px" />',
			isset( $this->options['slogan'] ) ? esc_attr( $this->options['slogan']) : ''
		);
	}
	public function slogan_translate_callback()
	{
		printf(
			'<input type="text" id="slogan_translate" name="my_option_name[slogan_translate]" value="%s" style="width:300px" />',
			isset( $this->options['slogan_translate'] ) ? esc_attr( $this->options['slogan_translate']) : ''
		);
	}



}

if( is_admin() )
	$my_settings_page = new MySettingsPage();