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-rw-r--r--system/libraries/User_agent.php19
1 files changed, 15 insertions, 4 deletions
diff --git a/system/libraries/User_agent.php b/system/libraries/User_agent.php
index 2f6f81909..50ac9be98 100644
--- a/system/libraries/User_agent.php
+++ b/system/libraries/User_agent.php
@@ -471,13 +471,24 @@ class CI_User_agent {
*/
public function is_referral()
{
- if (empty($_SERVER['HTTP_REFERER']))
+ static $result;
+
+ if ( ! isset($result))
{
- return FALSE;
+ if (empty($_SERVER['HTTP_REFERER']))
+ {
+ $result = FALSE;
+ }
+ else
+ {
+ $referer_host = @parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);
+ $own_host = parse_url(config_item('base_url'), PHP_URL_HOST);
+
+ $result = ($referer_host && $referer_host !== $own_host);
+ }
}
- $referer = parse_url($_SERVER['HTTP_REFERER']);
- return ! (empty($referer['host']) && strpos(config_item('base_url'), $referer['host']) !== FALSE);
+ return $result;
}
// --------------------------------------------------------------------