Gravity Forms notifcation attachments

gforms-notification-attachments.php

<?php
function gs_has_http($url) {
	$http = substr($url, 0, 7);
	$https = substr($url, 0, 8);

	if ( $http == 'http://' ) {
		return true;
	} elseif ( $https == 'https://' ) {
		return true;
	} else {
		return false;
	}
}


add_filter("gform_user_notification_attachments_2", "add_attachment", 10, 3);
function add_attachment($attachments, $lead, $form){

	$checkbox_fields = GFCommon::get_fields_by_type($form, array("checkbox"));

	/**
	 * Build an array containing the ID's of every checkbox
	 * in this form.
	 * 
	 */
	$checkboxes = array();
	foreach ($checkbox_fields as $checkbox_field) {
		$inputs = $checkbox_field["inputs"];
		foreach($inputs as $input) {
			$input_id = $input["id"];
			$checkboxes[] = $input_id;
		}
	}

	/**
	 * Cycle through the form's checkboxes
	 * 
	 * If a checkbox was selected and is assigned to a URL value, add
	 * that URL as a file attachment to the notification email.
	 */
	$attachments = array();
	foreach ($checkboxes as $checkbox) {
		if ($lead[$checkbox] && gs_has_http($lead[$checkbox])) {
			$attachment = $_SERVER['DOCUMENT_ROOT'] . wp_make_link_relative($lead[$checkbox]);
			$attachments[] = $attachment;
		}
	}

    return $attachments;
}