Add PHP stub file

msgpack-stub.php

@@ -0,0 +1,48 @@
+<?php
+
+class MessagePack {
+
+    public const OPT_PHPONLY = -1001;
+    public const OPT_ASSOC = -1002;
+
+    public function __construct(bool $phponly = false) {}
+
+    public function pack(mixed $data): string {}
+
+    public function setOption(int $option, mixed $value): bool {}
+
+    public function unpack(string $serialized): mixed {}
+
+    public function unpacker(): MessagePackUnpacker {}
+}
+
+class MessagePackUnpacker {
+
+    public function __construct(bool $phponly = false) {}
+
+    public function __destruct() {}
+
+    public function data(string|object|null $object = null): mixed {}
+
+    public function execute(int|float|null $offset = null): bool {}
+
+    public function feed(string $chunk): bool {}
+
+    public function reset(): void {}
+
+    public function setOption(int $option, mixed $value): bool {}
+}
+
+function msgpack_serialize(mixed $value): string {}
+
+/**
+ * alias for msgpack_serialize()
+ */
+function msgpack_pack(mixed $value): string {}
+
+function msgpack_unserialize(string $str): mixed {}
+
+/**
+ * alias for msgpack_unserialize()
+ */
+function msgpack_unpack(string $str): mixed {}