diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b04a7ecc..77bac6dd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,10 +1,19 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 name: CI
 
 on:
   push:
     branches:
       - master
-      - 0.4.x-dev
   pull_request:
     branches: [ "**" ]
 
diff --git a/.github/workflows/license.yml b/.github/workflows/license.yml
new file mode 100644
index 00000000..f0448bc7
--- /dev/null
+++ b/.github/workflows/license.yml
@@ -0,0 +1,30 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
+name: License
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  license-check:
+    name: License check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Check License Header
+        uses: apache/skywalking-eyes/header/@d5466651aaded6fbd588d2278eccc469afc89d92
+        with:
+          config: .licenserc.yaml
diff --git a/.licenserc.yaml b/.licenserc.yaml
new file mode 100644
index 00000000..52721594
--- /dev/null
+++ b/.licenserc.yaml
@@ -0,0 +1,33 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
+header:
+  license:
+    spdx-id: MulanPSL-2.0
+    copyright-owner: jmjoy
+    software-name: PHPER
+
+  paths-ignore:
+    - 'LICENSE'
+    - 'NOTICE'
+    - '**/*.md'
+    - '**/*.lock'
+    - '**/.gitignore'
+    - '**/.gitmodules'
+    - 'vendor'
+    - '.cargo'
+    - '.vscode'
+    - '.idea'
+
+  comment: on-failure
+
+dependency:
+  files:
+    - Cargo.toml
diff --git a/.rustfmt.toml b/.rustfmt.toml
index d5c73b2d..1c500095 100644
--- a/.rustfmt.toml
+++ b/.rustfmt.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 fn_args_layout = "Compressed"
 format_code_in_doc_comments = true
 format_macro_bodies = true
diff --git a/Cargo.toml b/Cargo.toml
index 04cab855..04d47860 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [workspace]
 members = [
     "phper",
diff --git a/examples/hello/Cargo.toml b/examples/hello/Cargo.toml
index be3cfba2..1ed5d02c 100644
--- a/examples/hello/Cargo.toml
+++ b/examples/hello/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "hello"
 version = "0.0.0"
diff --git a/examples/http-client/Cargo.toml b/examples/http-client/Cargo.toml
index 3ebee03f..78662fdc 100644
--- a/examples/http-client/Cargo.toml
+++ b/examples/http-client/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "http-client"
 version = "0.0.0"
diff --git a/examples/http-server/Cargo.toml b/examples/http-server/Cargo.toml
index cc7ea236..b94cf00f 100644
--- a/examples/http-server/Cargo.toml
+++ b/examples/http-server/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "http-server"
 version = "0.0.0"
diff --git a/examples/logging/Cargo.toml b/examples/logging/Cargo.toml
index 2d8fd959..1d8b17ee 100644
--- a/examples/logging/Cargo.toml
+++ b/examples/logging/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "logging"
 version = "0.0.0"
diff --git a/phper-alloc/Cargo.toml b/phper-alloc/Cargo.toml
index 2f87c8a0..cadff571 100644
--- a/phper-alloc/Cargo.toml
+++ b/phper-alloc/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "phper-alloc"
 version = "0.4.0-alpha.3"
diff --git a/phper-alloc/src/macros.rs b/phper-alloc/src/macros.rs
index 3fc86ec5..9f9e0569 100644
--- a/phper-alloc/src/macros.rs
+++ b/phper-alloc/src/macros.rs
@@ -1,3 +1,13 @@
+// Copyright (c) 2019 jmjoy
+// PHPER is licensed under Mulan PSL v2.
+// You can use this software according to the terms and conditions of the Mulan
+// PSL v2. You may obtain a copy of Mulan PSL v2 at:
+//          http://license.coscl.org.cn/MulanPSL2
+// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+// See the Mulan PSL v2 for more details.
+
 /// Wrapper of `EBox::new`.
 ///
 /// # Examples
diff --git a/phper-build/Cargo.toml b/phper-build/Cargo.toml
index 3e14b506..76b1fd7d 100644
--- a/phper-build/Cargo.toml
+++ b/phper-build/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "phper-build"
 version = "0.4.0-alpha.3"
diff --git a/phper-macros/Cargo.toml b/phper-macros/Cargo.toml
index ce84e973..264a3be0 100644
--- a/phper-macros/Cargo.toml
+++ b/phper-macros/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "phper-macros"
 version = "0.4.0-alpha.3"
diff --git a/phper-sys/Cargo.toml b/phper-sys/Cargo.toml
index ea1f358b..5cd282c9 100644
--- a/phper-sys/Cargo.toml
+++ b/phper-sys/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "phper-sys"
 version = "0.4.0-alpha.3"
diff --git a/phper-test/Cargo.toml b/phper-test/Cargo.toml
index 43e6e6f7..90ee60f1 100644
--- a/phper-test/Cargo.toml
+++ b/phper-test/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "phper-test"
 version = "0.4.0-alpha.3"
diff --git a/phper-test/etc/php-fpm.conf b/phper-test/etc/php-fpm.conf
index 0f6860f4..c7908037 100644
--- a/phper-test/etc/php-fpm.conf
+++ b/phper-test/etc/php-fpm.conf
@@ -1,3 +1,13 @@
+; Copyright (c) 2019 jmjoy
+; PHPER is licensed under Mulan PSL v2.
+; You can use this software according to the terms and conditions of the Mulan
+; PSL v2. You may obtain a copy of Mulan PSL v2 at:
+;          http://license.coscl.org.cn/MulanPSL2
+; THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+; KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+; NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+; See the Mulan PSL v2 for more details.
+
 [global]
 error_log = /tmp/.php-fpm.log
 
diff --git a/phper/Cargo.toml b/phper/Cargo.toml
index 2a0e78d3..60c62d09 100644
--- a/phper/Cargo.toml
+++ b/phper/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "phper"
 version = "0.4.0-alpha.3"
diff --git a/phper/src/values.rs b/phper/src/values.rs
index 0fd298aa..50d1b6db 100644
--- a/phper/src/values.rs
+++ b/phper/src/values.rs
@@ -27,7 +27,6 @@ use std::{
     convert::TryInto,
     marker::PhantomData,
     mem::{transmute, zeroed, MaybeUninit},
-    os::raw::c_int,
     str,
 };
 
@@ -120,7 +119,7 @@ impl ExecuteData {
 
     pub fn get_parameter(&mut self, index: usize) -> &mut ZVal {
         unsafe {
-            let val = phper_zend_call_arg(self.as_mut_ptr(), index as c_int);
+            let val = phper_zend_call_var_num(self.as_mut_ptr(), index.try_into().unwrap());
             ZVal::from_mut_ptr(val)
         }
     }
@@ -306,7 +305,7 @@ impl ZVal {
     }
 
     fn inner_expect_z_res(&self) -> crate::Result<&mut ZRes> {
-        if self.get_type_info().is_object() {
+        if self.get_type_info().is_resource() {
             unsafe { Ok(ZRes::from_mut_ptr(phper_z_res_p(self.as_ptr()))) }
         } else {
             Err(ExpectTypeError::new(TypeInfo::RESOURCE, self.get_type_info()).into())
diff --git a/tests/integration/Cargo.toml b/tests/integration/Cargo.toml
index d5914de5..cc6e5e04 100644
--- a/tests/integration/Cargo.toml
+++ b/tests/integration/Cargo.toml
@@ -1,3 +1,13 @@
+# Copyright (c) 2019 jmjoy
+# PHPER is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan
+# PSL v2. You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY
+# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+# NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+# See the Mulan PSL v2 for more details.
+
 [package]
 name = "integration"
 version = "0.0.0"