Move session ID check to SessionManager

Relates to https://github.com/shaarli/Shaarli/issues/324

Changed:
- `is_session_id_valid()` -> `SessionManager::checkId()`
- update tests

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/index.php b/index.php
index 9e698628..e1516d37 100644
--- a/index.php
+++ b/index.php
@@ -116,7 +116,7 @@ if (session_id() == '') {
 }
 
 // Regenerate session ID if invalid or not defined in cookie.
-if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
+if (isset($_COOKIE['shaarli']) && !SessionManager::checkId($_COOKIE['shaarli'])) {
     session_regenerate_id(true);
     $_COOKIE['shaarli'] = session_id();
 }