Changed form_open() to compare $action against base_url()

Checking for strpos($action, $CI->config->site_url()) === FALSE causes
CSRF token to not be added in form_open() output. When site_url()'s
first parameter ($uri) is empty, site_url's return value is the base
URL plus the $CI->config->item('index_page') value. form_open() and
CodeIgniter's URI routing do not require index.php to be in the URL, so
any call to form_open() in which the $action parameter does not have
index.php will always return false for the strpos() call.

system/helpers/form_helper.php

@@ -65,7 +65,7 @@ function form_open($action = '', $attributes = '', $hidden = array())
 		$form .= '>';
 
 		// Add CSRF field if enabled, but leave it out for GET requests and requests to external websites	
-		if ($CI->config->item('csrf_protection') === TRUE AND ! (strpos($action, $CI->config->site_url()) === FALSE OR strpos($form, 'method="get"')))	
+		if ($CI->config->item('csrf_protection') === TRUE AND ! (strpos($action, $CI->config->base_url()) === FALSE OR strpos($form, 'method="get"')))	
 		{
 			$hidden[$CI->security->get_csrf_token_name()] = $CI->security->get_csrf_hash();
 		}

user_guide/changelog.html

@@ -71,6 +71,7 @@ <h2>Version 2.1.1</h2>
 <h3>Bug fixes for 2.1.1</h3>
 <ul>
 	<li>Fixed a bug (#697) - A wrong array key was used in the Upload library to check for mime-types.</li>
+	<li>Fixed a bug - form_open() compared $action against site_url() instead of base_url()</li>
 </ul>