In Drupal,forms that are displayed in a web browser can also be filled out programmatically.

Here is an example to fill out our firstname and lastname programmatically.

$form_id = 'formexample_nameform';
$field_values = array(
   'user_firstname' => t('Kiran'),
   'user_lastname' => t('Hota')
);
// Submit the form using these values.
drupal_execute($form_id, $field_values);

Just supply the form ID and the values for the form, and call
drupal_execute().