--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Cache\Marshaller;
+
+/**
+ * Serializes/unserializes PHP values.
+ *
+ * Implementations of this interface MUST deal with errors carefully. They MUST
+ * also deal with forward and backward compatibility at the storage format level.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface MarshallerInterface
+{
+ /**
+ * Serializes a list of values.
+ *
+ * When serialization fails for a specific value, no exception should be
+ * thrown. Instead, its key should be listed in $failed.
+ */
+ public function marshall(array $values, ?array &$failed): array;
+
+ /**
+ * Unserializes a single value and throws an exception if anything goes wrong.
+ *
+ * @return mixed
+ *
+ * @throws \Exception Whenever unserialization fails
+ */
+ public function unmarshall(string $value);
+}