stop caching schema version entirely, fix some session_start() related warnings

api/index.php

@@ -23,7 +23,7 @@
 
 	if (!empty($_REQUEST["sid"])) {
 		session_id($_REQUEST["sid"]);
-		@session_start();
+		session_start();
 	}
 
 	startup_gettext();

classes/api.php

@@ -59,8 +59,12 @@ class API extends Handler {
 	}
 
 	function login() {
-		@session_destroy();
-		@session_start();
+
+		if (session_status() == PHP_SESSION_ACTIVE) {
+			session_destroy();
+		}
+
+		session_start();
 
 		$login = clean($_REQUEST["user"]);
 		$password = clean($_REQUEST["password"]);

classes/handler/public.php

@@ -390,7 +390,8 @@ class Handler_Public extends Handler {
 			} else {
 
 				// start an empty session to deliver login error message
-				@session_start();
+				if (session_status() != PHP_SESSION_ACTIVE)
+					session_start();
 
 				if (!isset($_SESSION["login_error_msg"]))
 					$_SESSION["login_error_msg"] = __("Incorrect username or password");

classes/userhelper.php

@@ -87,7 +87,9 @@ class UserHelper {
 		$pdo = Db::pdo();
 
 		if (Config::get(Config::SINGLE_USER_MODE)) {
-			@session_start();
+			if (session_status() != PHP_SESSION_ACTIVE)
+					session_start();
+
 			self::authenticate("admin", null);
 			startup_gettext();
 			self::load_user_plugins($_SESSION["uid"]);

include/functions.php

@@ -305,22 +305,14 @@
 		return $s ? 1 : 0;
 	}
 
-	// Session caching removed due to causing wrong redirects to upgrade
-	// script when get_schema_version() is called on an obsolete session
-	// created on a previous schema version.
-	function get_schema_version($nocache = false) {
-		global $schema_version;
-
+	function get_schema_version() {
 		$pdo = Db::pdo();
 
-		if (!$schema_version && !$nocache) {
-			$row = $pdo->query("SELECT schema_version FROM ttrss_version")->fetch();
-			$version = $row["schema_version"];
-			$schema_version = $version;
-			return $version;
-		} else {
-			return $schema_version;
-		}
+		$row = $pdo->query("SELECT schema_version FROM ttrss_version")->fetch();
+		$version = $row["schema_version"];
+		$schema_version = $version;
+
+		return $version;
 	}
 
 	function file_is_locked($filename) {

include/sessions.php

@@ -152,6 +152,7 @@
 
 	if (!defined('NO_SESSION_AUTOSTART')) {
 		if (isset($_COOKIE[session_name()])) {
-			@session_start();
+			if (session_status() != PHP_SESSION_ACTIVE)
+					session_start();
 		}
 	}