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Submiting a form

/**
* Process a validated example admin setting submission.
*/
function example_admin_settings_form_submit($form, &$form_state) {
  // Rebuild the form.
  $form_state['rebuild'] = TRUE;

  // Save example setting variables.
  variable_set('example_gmap', $form_state['values']['example_gmap']);
  variable_set('example_default_center_lat', $form_state['values']['example_default_center_lat']);
  variable_set('example_default_center_long', $form_state['values']['example_default_center_long']);
  variable_set('example_default_gmap_zoom', $form_state['values']['example_default_gmap_zoom']);

  // Notify user.
  drupal_set_message(t('Wind Farm settings saved.'));
}

code type: 
hook_drupal