Get_setting: Deprecated

Hello everybody !

Actually, i want to create a wordpress theme
to diffuse it for free.
But i got a problem :
I followed this example : http://alisothegeek.com/2011/01/wordpress-settings-api-tutorial-1/
But he’s using twice this function : get_setting, who’s
deprecated.

This is the location of these functions :

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// This will keep track of the checkbox options for the validate_settings function.
		$this->checkboxes = array();
		$this->settings = array();
		$this-><strong>get_settings();</strong>
		$this->sections['header']        = __( 'Header' );
		$this->sections['menu']        = __( 'Menu' );

And :

register_settings() {

		register_setting( 'mytheme_options', 'mytheme_options', array ( &$this, 'validate_settings' ) );

		foreach ( $this->sections as $slug => $title ) {
			if ( $slug == 'about' )
				add_settings_section( $slug, $title, array( &$this, 'display_about_section' ), 'mytheme-options' );
			else
				add_settings_section( $slug, $title, array( &$this, 'display_section' ), 'mytheme-options' );
		}

		$this-><strong>get_settings();</strong>

		foreach ( $this->settings as $id => $setting ) {
			$setting['id'] = $id;
			$this->create_setting( $setting );
		}

	}

I need help guys !
Thank you for reading !