I have googled and binged and yahooed this question but can't seem to find an answer. I was working on a form that included over 800 fields but the form's submit function would never execute. After I pared the form down, the submit function ran. So now I'm curious if there's an actual built in maximum number of elements.

1 Answer 1


I think, the issue is related to Server configuration, not with Drupal.

There is max_input_vars variable in php.ini which define the maximum number of variable form elements that can be submitted to a single page.

The “max_input_vars” setting in the php.ini file is a relatively new option starting last year from PHP 5.3.9. It allows you to control the maximum number of form elements on a page. Some webpages have a large amount of forms/fields for administrative or page configuration purposes. In those cases, we need to increase the number of this value in order to properly view those pages.

There is also post_max_size variable in php.ini.

post_max_size sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than upload_max_filesize. If memory limit is enabled by your configure script, memory_limit also affects file uploading. Generally speaking, memory_limit should be larger than post_max_size. If the size of post data is greater than post_max_size, the $_POST and $_FILES superglobals are empty.

You can check the this for more details.

  • It is worth adding the information about the variable post_max_size which worked for older PHP versions too.
    – AjitS
    Commented Oct 30, 2013 at 5:30
  • @AjitS, I have edit my answer. Thanks for your suggestion. Commented Oct 30, 2013 at 5:36
  • Thank you. That makes sense. I'm sure I'm hitting one of these limits. My webhost has set max_input_vars to 5000 and post_max_size to 8M. I'll live with the smaller form.
    – Robbert
    Commented Oct 30, 2013 at 15:59

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