diff --git a/src/Container.php b/src/Container.php
index e3c0c990..98f3e91e 100644
--- a/src/Container.php
+++ b/src/Container.php
@@ -2,6 +2,8 @@
 
 namespace Laminas\Session;
 
+use function count;
+
 /**
  * Session storage container
  *
@@ -30,4 +32,17 @@ public function &offsetGet($key)
 
         return $ret;
     }
+
+    /**
+     * Get the number of set values in container.
+     *
+     * @return int
+     */
+    public function count()
+    {
+        $storage = $this->getStorage();
+        $name    = $this->getName();
+
+        return count($storage[$name]);
+    }
 }
diff --git a/test/ContainerTest.php b/test/ContainerTest.php
index 56b11b7e..df0dc6a1 100644
--- a/test/ContainerTest.php
+++ b/test/ContainerTest.php
@@ -560,4 +560,19 @@ public function testGetArrayCopyAfterExchangeArray(): void
         self::assertIsArray($contents);
         self::assertArrayHasKey('foo', $contents, "'getArrayCopy' doesn't return exchanged array");
     }
+
+    /**
+     * Test count method is retrieving
+     * set values quantity.
+     *
+     * @test
+     */
+    public function testCountIsRetrievingSetValuesQuantity(): void
+    {
+        $this->container->foo = ['bar' => 'baz'];
+        $this->container->bar = ['foo' => 'baz'];
+        $this->container->baz = ['bar' => 'foo'];
+
+        self::assertCount(3, $this->container);
+    }
 }