Node types selection for migration modules forms

select_node_types_form.php

   $types = node_type_get_types();
   $option_types = array();
   foreach($types as $type){
     $option_types[$type->type] = $type->name;
   }

   $form['migration_type'] = array(
	'#type' => 'select',
	'#options' =>  $option_types,
	'#title' => t('Select the contet type to be created?'),
	'#default_value' => variable_get('migration_type', ''),
	'#required' => TRUE,
    );