Fix #20140: Fix compatibility with PHP 8.4: calling session_set_save_handler()

framework/CHANGELOG.md

@@ -18,6 +18,7 @@ Yii Framework 2 Change Log
 - New #20279: Add to the `\yii\web\Request` CSRF validation by custom HTTP header (olegbaturin)
 - Enh #20279: Add to the `\yii\web\Request` `csrfHeader` property to configure a custom  HTTP header for CSRF validation (olegbaturin)
 - Enh #20279: Add to the `\yii\web\Request` `csrfTokenSafeMethods` property to configure a custom safe HTTP methods list (olegbaturin)
+- Bug #20140: Fix compatibility with PHP 8.4: calling `session_set_save_handler()` (Izumi-kun)
 
 2.0.51 July 18, 2024
 --------------------

framework/UPGRADE.md

@@ -51,6 +51,13 @@ if you want to upgrade from version A to version C and there is
 version B between A and C, you need to follow the instructions
 for both A and B.
 
+Upgrade from Yii 2.0.51
+-----------------------
+
+* The function signature for `yii\web\Session::readSession()` and `yii\web\Session::gcSession()` have been changed.
+  They now have the same return types as `\SessionHandlerInterface::read()` and `\SessionHandlerInterface::gc()` respectively.
+  In case those methods have overwritten you will need to update your child classes accordingly.
+
 Upgrade from Yii 2.0.50
 -----------------------
 

framework/web/CacheSession.php

@@ -92,7 +92,7 @@ class CacheSession extends Session
      * Session read handler.
      * @internal Do not call this method directly.
      * @param string $id session ID
-     * @return string the session data
+     * @return string|false the session data, or false on failure
      */
     public function readSession($id)
     {

framework/web/DbSession.php

@@ -171,7 +171,7 @@ class DbSession extends MultiFieldSession
      * Session read handler.
      * @internal Do not call this method directly.
      * @param string $id session ID
-     * @return string the session data
+     * @return string|false the session data, or false on failure
      */
     public function readSession($id)
     {
@@ -247,15 +247,13 @@ class DbSession extends MultiFieldSession
      * Session GC (garbage collection) handler.
      * @internal Do not call this method directly.
      * @param int $maxLifetime the number of seconds after which data will be seen as 'garbage' and cleaned up.
-     * @return bool whether session is GCed successfully
+     * @return int|false the number of deleted sessions on success, or false on failure
      */
     public function gcSession($maxLifetime)
     {
-        $this->db->createCommand()
+        return $this->db->createCommand()
             ->delete($this->sessionTable, '[[expire]]<:expire', [':expire' => time()])
             ->execute();
-
-        return true;
     }
 
     /**

framework/web/Session.php

@@ -175,34 +175,23 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
             static::$_originalSessionModule = $sessionModuleName;
         }
 
+        if ($this->handler === null && $this->getUseCustomStorage()) {
+            $this->handler = Yii::createObject(
+                [
+                    '__class' => SessionHandler::class,
+                    '__construct()' => [$this],
+                ]
+            );
+        }
+
         if ($this->handler !== null) {
-            if (!is_object($this->handler)) {
+            if (is_array($this->handler)) {
                 $this->handler = Yii::createObject($this->handler);
             }
             if (!$this->handler instanceof \SessionHandlerInterface) {
                 throw new InvalidConfigException('"' . get_class($this) . '::handler" must implement the SessionHandlerInterface.');
             }
             YII_DEBUG ? session_set_save_handler($this->handler, false) : @session_set_save_handler($this->handler, false);
-        } elseif ($this->getUseCustomStorage()) {
-            if (YII_DEBUG) {
-                session_set_save_handler(
-                    [$this, 'openSession'],
-                    [$this, 'closeSession'],
-                    [$this, 'readSession'],
-                    [$this, 'writeSession'],
-                    [$this, 'destroySession'],
-                    [$this, 'gcSession']
-                );
-            } else {
-                @session_set_save_handler(
-                    [$this, 'openSession'],
-                    [$this, 'closeSession'],
-                    [$this, 'readSession'],
-                    [$this, 'writeSession'],
-                    [$this, 'destroySession'],
-                    [$this, 'gcSession']
-                );
-            }
         } elseif (
             $sessionModuleName !== static::$_originalSessionModule
             && static::$_originalSessionModule !== null
@@ -610,7 +599,7 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
      * This method should be overridden if [[useCustomStorage]] returns true.
      * @internal Do not call this method directly.
      * @param string $id session ID
-     * @return string the session data
+     * @return string|false the session data, or false on failure
      */
     public function readSession($id)
     {
@@ -647,11 +636,11 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
      * This method should be overridden if [[useCustomStorage]] returns true.
      * @internal Do not call this method directly.
      * @param int $maxLifetime the number of seconds after which data will be seen as 'garbage' and cleaned up.
-     * @return bool whether session is GCed successfully
+     * @return int|false the number of deleted sessions on success, or false on failure
      */
     public function gcSession($maxLifetime)
     {
-        return true;
+        return 0;
     }
 
     /**

framework/web/SessionHandler.php

@@ -0,0 +1,79 @@
+<?php
+/**
+ * @link https://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license https://www.yiiframework.com/license/
+ */
+
+namespace yii\web;
+
+use SessionHandlerInterface;
+
+/**
+ * SessionHandler implements an [[\SessionHandlerInterface]] for handling [[Session]] with custom session storage.
+ *
+ * @author Viktor Khokhryakov <viktor.khokhryakov@gmail.com>
+ * @since 2.0.52
+ */
+class SessionHandler implements SessionHandlerInterface
+{
+    /**
+     * @var Session
+     */
+    private $_session;
+
+    public function __construct(Session $session)
+    {
+        $this->_session = $session;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function close(): bool
+    {
+        return $this->_session->closeSession();
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function destroy($id): bool
+    {
+        return $this->_session->destroySession($id);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    #[\ReturnTypeWillChange]
+    public function gc($max_lifetime)
+    {
+        return $this->_session->gcSession($max_lifetime);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function open($path, $name): bool
+    {
+        return $this->_session->openSession($path, $name);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    #[\ReturnTypeWillChange]
+    public function read($id)
+    {
+        return $this->_session->readSession($id);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function write($id, $data): bool
+    {
+        return $this->_session->writeSession($id, $data);
+    }
+}