WordPress add settings field dynamically using associative arrays

functions.php

<?php 
add_action('admin_menu', 'myTheme_admin');
function myTheme_admin() {
  /* Base Menu */
  add_menu_page(
  'myTheme settings',  // Admin page title
  'myTheme settings',  // Admin menu label
  'manage_options',
  'myTheme-general-options', // Admin slug
  'myTheme_general_index'); // Display Page
}

add_action('admin_init', 'myTheme_options');
function myTheme_options() { 
  $settings = array(
    'setting_1_id' => array(
      'title'=>'First Box Settings',
      'page'=>'first_box_option',
      'fields'=> array(
        array(
          'id'=> 'box_first_title',
          'title'=>'Title',
          'callback'=> 'text_callback'
          ),
        array(
          'id'=> 'box_first_desc',
          'title'=>'Description',
          'callback'=> 'textarea_callback'
          ),
        array(
          'id'=> 'box_first_link',
          'title'=>'Link',
          'callback'=> 'text_callback'
          ),

        )
      ),
    'setting_2_id' => array(
      'title'=>'Second Box Settings',
      'page'=>'second_box_option',
      'fields'=> array(
        array(
          'id'=> 'box_second_title',
          'title'=>'Title',
          'callback'=> 'text_callback'
          ),
        array(
          'id'=> 'box_second_desc',
          'title'=>'Description',
          'callback'=> 'textarea_callback'
          ),
        array(
          'id'=> 'box_second_link',
          'title'=>'Link',
          'callback'=> 'text_callback'
          ),

        )
      ),
    'setting_3_id' => array(
      'title'=>'Third Box Settings',
      'page'=>'third_box_option',
      'fields'=> array(
        array(
          'id'=> 'box_third_title',
          'title'=>'Title',
          'callback'=> 'text_callback'
          ),
        array(
          'id'=> 'box_third_desc',
          'title'=>'Description',
          'callback'=> 'textarea_callback'
          ),
        array(
          'id'=> 'box_third_link',
          'title'=>'Link',
          'callback'=> 'text_callback'
          ),

        )
      ),

  );
	foreach( $settings as $id => $values){
		add_settings_section( 
	        $id, // ID used to identify this section and with which to register options
	        $values['title'],
	        'boxes_front_page_callback', // Callback used to render the description of the section
	        $values['page'] // Page on which to add this section of options
	    );
	    
	    foreach ($values['fields'] as $field) {
	    	// code...
	    	add_settings_field(  
		        $field['id'],         // ID used to identify the field throughout the theme             
		        $field['title'],                    // The label to the left of the option interface element
		        $field['callback'],   
		        $values['page'],         // The page on which this option will be added            
		        $id,          // ID of the section
		        array(
		            $values['page'],		//option name
		            $field['title']		//id 
		        ) 
		    );
	    }
	    
	    register_setting($values['page'], $values['page']);
	    
	} // end of foreach
} // end of myTheme_options()

/*********************************
 * Callbacks
**********************************/
function boxes_front_page_callback() { 
    echo '<p>Lorem ipsum</p>'; 
}

function text_callback($args) { 

    $options = get_option($args[0]); 

    echo '<input type="text" class="regular-text" id="'  . $args[1] . '" name="'. $args[0] .'['  . $args[1] . ']" value="' . $options[''  . $args[1] . ''] . '"></input>';

}


function textarea_callback($args) { 

    $options = get_option($args[0]); 

    echo '<textarea rows="8" cols="50" class="large-text" id="'  . $args[1] . '" name="'. $args[0] .'['  . $args[1] . ']">' . $options[''  . $args[1] . ''] . '</textarea>';

}

/***************************************
 * Display Page
 ***************************************/
function myTheme_general_index() {
?>
    <div class="wrap">  
        <div id="icon-themes" class="icon32"></div>  
        <h2>myTheme Settings</h2>  
        <?php settings_errors(); ?>  

        <?php  
                $active_tab = isset( $_GET[ 'tab' ] ) ? $_GET[ 'tab' ] : 'boks_pierwszy';  
        ?>  

        <h2 class="nav-tab-wrapper">  
            <a href="?page=myTheme-general-options&tab=first" class="nav-tab <?php echo $active_tab == 'first' ? 'nav-tab-active' : ''; ?>">First Tab</a>  
            <a href="?page=myTheme-general-options&tab=second" class="nav-tab <?php echo $active_tab == 'second' ? 'nav-tab-active' : ''; ?>">Second Tab</a>
            <a href="?page=myTheme-general-options&tab=third" class="nav-tab <?php echo $active_tab == 'third' ? 'nav-tab-active' : ''; ?>">Third Tab</a>
        </h2>  


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

            <?php 
            if( $active_tab == 'first' ) {  
                settings_fields( 'first_box_option' );
                do_settings_sections( 'first_box_option' ); 
            } else if( $active_tab == 'second' ) {
                settings_fields( 'second_box_option' );
                do_settings_sections( 'second_box_option' );
            } else if( $active_tab == 'third' ) {
                settings_fields( 'third_box_option' );
                do_settings_sections( 'third_box_option' );
            } 
            ?>             
            <?php submit_button(); ?>
        </form> 

    </div> 
<?php
}
?>