Fix for an error if save handler use mysql and destroy expired session.

src/SaveHandler/DbTableGateway.php

@@ -106,6 +106,7 @@ public function read($id, $destroyExpired = true)
                 return (string) $row->{$this->options->getDataColumn()};
             }
             if ($destroyExpired) {
+                $rows = null;
                 $this->destroy($id);
             }
         }

test/SaveHandler/DbTableGatewayTest.php

@@ -211,6 +211,33 @@ public function testExpiredSessionDoesNotCauseARecursion()
         $this->adapter->query("DELETE FROM `sessions` WHERE `{$this->options->getIdColumn()}` = '123';");
     }
 
+    public function testReadDestroysExpiredSession()
+    {
+        $this->usedSaveHandlers[] = $saveHandler = new DbTableGateway($this->tableGateway, $this->options);
+        $saveHandler->open('savepath', 'sessionname');
+
+        $id = '345';
+
+        $this->assertTrue($saveHandler->write($id, serialize($this->testArray)));
+
+        // set lifetime to 0
+        $query = <<<EOD
+UPDATE `sessions`
+    SET `{$this->options->getLifetimeColumn()}` = 0
+WHERE
+    `{$this->options->getIdColumn()}` = {$id}
+    AND `{$this->options->getNameColumn()}` = 'sessionname'
+EOD;
+        $this->adapter->query($query, Adapter::QUERY_MODE_EXECUTE);
+
+        // check destroy session
+        $result = $saveHandler->read($id);
+        $this->assertEquals($result, '');
+
+        // cleans the test record from the db
+        $this->adapter->query("DELETE FROM `sessions` WHERE `{$this->options->getIdColumn()}` = {$id};");
+    }
+
     /**
      * Sets up the database connection and creates the table for session data
      *