Dynamically populate checkboxes

//-------------------------------------------------------
//----------- Dynamically Populate Checkbox  ------------
//-------------------------------------------------------
// Alex Cancado February 1, 2013
// http://www.gravityhelp.com/forums/topic/not-all-the-selected-values-from-checkboxes-are-being-saved-to-the-database#post-137484
// NOTE: update the '221' to the ID of your form
add_filter('gform_pre_render_221', 'populate_checkbox');
add_filter("gform_pre_submission_filter_221", "populate_checkbox");

function populate_checkbox($form){

    foreach($form['fields'] as &$field){

        //NOTE: replace 3 with your checkbox field id
        $field_id = 3;
        if($field['id'] != $field_id)
            continue;

        // you can add additional parameters here to alter the posts that are retreieved
        // more info: http://codex.wordpress.org/Template_Tags/get_posts
        $posts = get_posts('numberposts=-1&post_status=publish');

        $input_id = 1;
        foreach($posts as $post){

            // skipping index that are multiples of 10 (multiples of 10 create problems as the input IDs)
            if($input_id % 10)
                $input_id++;

            $choices[] = array('text' => $post->post_title, 'value' => $post->post_title);
            $inputs[] = array("label" => $post->post_title, "id" => "{$field_id}.{$input_id}");

            $input_id++;
        }

        $field['choices'] = $choices;
        $field['inputs'] = $inputs;

    }

    return $form;
}