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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"zend_mm_heap corrupted when serializing/unserializing Enum","articleBody":"This one works fine:\n\n```php\nenum Random: int\n{\n    case One = 1;\n    case Two = 2;\n    case Three = 3;\n    case Four = 4;\n    case Five = 5;\n}\n\n$value = (object)[\n    'one' =\u003e Random::One\n];\n\n$serialized = msgpack_serialize($value);\n$unserialized = msgpack_unserialize($serialized);\n```\n\nThis one seems to fail with `zend_mm_heap corrupted` after running\n\n```php\nenum Random: int\n{\n    case One = 1;\n    case Two = 2;\n    case Three = 3;\n    case Four = 4;\n    case Five = 5;\n}\n\n$value = (object)[\n    'one' =\u003e Random::One\n];\n\n$serialized = msgpack_serialize($value);\n$unserialized = msgpack_unserialize($serialized);\n\n$serialized2 = msgpack_serialize($value);\n$unserialized = msgpack_unserialize($serialized);\n```\n\nUsing the object methods also fails:\n\n```php\n$value = (object)[\n    'one' =\u003e Random::One\n];\n\n$packer = new \\MessagePack(true);\n$unpacker = new \\MessagePackUnpacker(true);\n\n$serialized = $packer-\u003epack($value);\n$unpacker-\u003efeed($serialized);\n$unpacker-\u003eexecute();\n$unserialized = $unpacker-\u003edata();\n\n$unpacker-\u003ereset();\n\n$serialized2 = $packer-\u003epack($value);\n$unpacker-\u003efeed($serialized);\n$unpacker-\u003eexecute();\n$unserialized2 = $unpacker-\u003edata();\n\n$unpacker-\u003ereset();\n```\n\nErrors in both\n\n```\nPHP 8.4.14 (cli) (built: Oct 24 2025 19:07:34) (NTS)\nCopyright (c) The PHP Group\nBuilt by https://github.com/docker-library/php\nZend Engine v4.4.14, Copyright (c) Zend Technologies\n    with Zend OPcache v8.4.14, Copyright (c), by Zend Technologies\n    with Xdebug v3.4.7, Copyright (c) 2002-2025, by Derick Rethans\n```\n\nand\n\n```\nPHP 8.4.16 (cli) (built: Dec 16 2025 16:03:34) (NTS)\nCopyright (c) The PHP Group\nBuilt by Homebrew\nZend Engine v4.4.16, Copyright (c) Zend Technologies\n    with Xdebug v3.5.0, Copyright (c) 2002-2025, by Derick Rethans\n    with Zend OPcache v8.4.16, Copyright (c), by Zend Technologies\n```","author":{"url":"https://github.com/earthiverse","@type":"Person","name":"earthiverse"},"datePublished":"2026-01-08T03:36:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/181/msgpack-php/issues/181"}