WYSIWYG with Drupal Form API

Drupal Form API + WYSIWYG

<?php
$defaults = array(
  'value' => '',
  'format' => filter_default_format(),
);
$example = variable_get('example_variable', $defaults);

$form_['example'] = array(
  '#title' => t(''),
  '#type' => 'text_format',
  '#description' => t('),
  '#default_value' => $example['value'],
  '#format' => $example['format'],
);