Fixed Issue #80 (Serialized failed on unseted value)

Author: laruence

msgpack_pack.c

@@ -454,6 +454,7 @@ void msgpack_serialize_zval(smart_str *buf, zval *val, HashTable *var_hash) /* {
 	}
 
 	switch (Z_TYPE_P(val_noref)) {
+		case IS_UNDEF:
 		case IS_NULL:
 			msgpack_pack_nil(buf);
 			break;

tests/issue080.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Issue #80 (Serialized failed on unseted value)
+--SKIPIF--
+<?php
+if (!extension_loaded("msgpack")) {
+   echo "skip"; 
+}
+--FILE--
+<?php
+
+class MyClass
+{
+	protected $field;
+
+	public function preSerialize()
+	{
+		unset($this->field);
+	}
+}
+
+$t = new MyClass();
+$t->preSerialize();
+var_dump(msgpack_unserialize(msgpack_serialize($t)));
+?>
+--EXPECTF--
+object(MyClass)#%d (1) {
+  ["field":protected]=>
+  NULL
+}