Populate check boxes

public function fill_combine_order_form($form){

		foreach($form["fields"] as &$field) :

			/*
			*  Check boxes
			*
			*  Author Effectiva internet toepassingen
			*  @since 0.1
			*  @created: 8 november 2012
			*/

			if( $field['inputName'] == 'wp_combined_orders' ){

				// define values
				$this->combine_order_checkbox_choices = '';
				$this->combine_order_checkbox_choices = array(); // empty for conflicts

				// check if user has 'orders'
				$query_args = array(
					'post_type' => 'orders',
					'meta_query' => array(
					   array(
						   'key' => 'user',
						   'value' => $_SESSION['user_id'],
						   'compare' => '=',
					   ),
					   array(
						   'key' => 'status',
						   'value' => array( 2,3,4 ),
						   'compare' => 'IN',
					   )
				   	),
					'post_status' => 'publish'
				);

				$orders_query = new WP_Query( $query_args );

				if( $orders_query->found_posts >= 1 ){

					while ( $orders_query->have_posts() ) : $orders_query->the_post();

						$this->combine_order_checkbox_choices[] = array( "text" => get_the_title(), "value" => get_the_ID(), "isSelected" => '', "price" => '' );

					endwhile;
				}
				else {
					$field['type'] = 'html';
					$field['content'] = '0 orders found';
				}

				$field['choices'] = $this->combine_order_checkbox_choices;

				//$field['choices'] = $choices;
				//add_filter("gform_field_value_wp_combined_orders", "populate_checkbox");

			}

		endforeach;

		$this->form = $form;
	}