Multiple form on module page

Question

i created a module. I created a form and implemented it on the page:

function tudakozo_menu() {

  $items['tudakozo'] = array(
    'title' => t('Tudakozo'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('tudakozo_nevszerint_form'),
    'access callback' => TRUE,
  );

  return $items;
}

I would like to have an another form on this

Answer 1

Instead of using drupal_get_form as the page callback, you can specify a custom callback and build the forms there. An implementation in Drupal 6 would look similar to the following:

function tudakozo_menu() {

  $items['tudakozo'] = array(
    'title' => t('Tudakozo'),
    'page callback' => 'tudakozo_page_callback',
    'access callback' => TRUE,
  );

  return $items;
}

function tudakozo_page_callback() {
  $output = '';

  // Render your two forms here.
  $output .= drupal_get_form('tudakozo_nevszerint_form');
  $output .= drupal_get_form('tudakozo_second_form');

  return $output;
}

The only difference in Drupal 7 would be working with a render array as opposed to a string in the custom page callback similar to the code below:

function tudakozo_page_callback() {
  $build = array();

  // Render your two forms here.
  $build['form_one'] = drupal_get_form('tudakozo_nevszerint_form');
  $build['form_two'] = drupal_get_form('tudakozo_second_form');

  return $build;
}

Answer 2

Check here

4. Next step is to create a hook_theme() function to theame these forms.
function custom_salesforce_theme() {
  return array(
 // this template is containing theme style for update form
    'custom_salesforce_update_form' => array(
      'template' => 'theme/custom_salesforce_update_form',
      'render element' => 'form',
    ),
 // this template is containing theme style for login form
    'custom_salesforce_login_form' => array(
      'template' => 'theme/custom_salesforce_login_form',
      'render element' => 'form',
    ),
 // this template is containing theme style for both forms
    'custom_salesforce_login_and_update' => array(
      'template' => 'theme/custom_salesforce_login_and_update',
      'arguments' => array('combine_form' => NULL),
    ),
  );
}

Note- Don't forget to create three template files inside theme folder inside your module.
5. Next step to write template preprocessor functions to display individual fields in separate template files.
/**
 * Implements Template Preprocessor For User Login().
 */
function template_preprocess_custom_salesforce_login_form(&$variables) {
  $variables['rtc_registered_email'] = drupal_render($variables['form']['rtc_registered_email']);
  $variables['rtc_password'] = drupal_render($variables['form']['rtc_password']);
  $variables['rtc_submit_form'] = drupal_render_children($variables['form']);
}

Above code describes how you can add two forms.

Below here This is how you add it to tpl file

<?php
$form = drupal_get_form('user_register_form');
print drupal_render($form);
?>

Hope it helps :)