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Redirect to Continue Multi Step Form

I am building a form that can either begin on the home page or at the ‘/apply’ url. I used this tutorial to build the multi-step form. The form works great if I start from ‘/apply’ and begin at the very beginning of the form process. The form does not work if I start from the home page and get redirected to the second step of the form, then try to submit that second step. This is the error message I receive when I try to submit that second page of the form when I started on the home page:

PHP Fatal error:  Cannot create references to/from string offsets nor overloaded objects in /Applications/MAMP/htdocs/drupal/includes/common.inc on line 6548 PHP Stack trace: PHP   1. {main}() /Applications/MAMP/htdocs/drupal/index.php:0 PHP   2. menu_execute_active_handler() /Applications/MAMP/htdocs/drupal/index.php:21 PHP   3. call_user_func_array() /Applications/MAMP/htdocs/drupal/includes/menu.inc:517 PHP   4. drupal_get_form() /Applications/MAMP/htdocs/drupal/includes/menu.inc:517 PHP   5. drupal_build_form() /Applications/MAMP/htdocs/drupal/includes/form.inc:131 PHP   6. drupal_process_form() /Applications/MAMP/htdocs/drupal/includes/form.inc:374 PHP   7. form_builder() /Applications/MAMP/htdocs/drupal/includes/form.inc:842 PHP   8. form_builder() /Applications/MAMP/htdocs/drupal/includes/form.inc:1857 PHP   9. form_builder() /Applications/MAMP/htdocs/drupal/includes/form.inc:1857 PHP  10. form_builder() /Applications/MAMP/htdocs/drupal/includes/form.inc:1857 PHP  11. _form_builder_handle_input_element() /Applications/MAMP/htdocs/drupal/includes/form.inc:1795 PHP  12. drupal_array_set_nested_value() /Applications/MAMP/htdocs/drupal/includes/form.inc:2003

I am attempting to continue the multi-step form from the home page to the ‘/apply’ page by saving the $form_state['storage'] array in the session, then reading it out of the session in the custom_module_primary_form function.

//Save form 'storage' in $_SESSION function custom_module_first_form_submit($form, &$form_state) {   ...   if(request_path() == '') {     $form_state['redirect'] = array('apply');     $_SESSION['storage'] = $form_state['storage'];     $form_state['rebuild'] = FALSE;   } }

This is the modified custom_module_primary_form function from the tutorial.

//Read form 'storage' out of $_SESSION function custom_module_primary_form($form, &$form_state) {   // Check to see if anything has been stored.   if ($form_state['rebuild']) {     $form_state['input'] = array();   }    if (empty($form_state['storage'])) {     if(isset($_SESSION['storage'])) {       $form_state['submitted'] = TRUE;       $form_state['rebuild'] = TRUE;       $form_state['storage'] = $_SESSION['storage'];        unset($_SESSION['storage']);     } else {       // No step has been set so start with the first.       $form_state['storage'] = array(         'step' => 'custom_module_first_form',       );     }   }    // Return the current form   $function = $form_state['storage']['step'];   $form = $function($form, $form_state);   return $form; }
This article was republished from its original source.
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