diff --git a/.gitignore b/.gitignore
index a67d42b..77951aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 composer.phar
 /vendor/
+composer.lock
+.phpunit.result.cache
 
 # Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
 # You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..a062072
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,21 @@
+{
+    "name": "zhamao/config",
+    "description": "A simple json and php config provider supporting env variable",
+    "license": "Apache-2.0",
+    "authors": [
+        {
+            "name": "whale",
+            "email": "crazysnowcc@gamil.com"
+        }
+    ],
+    "minimum-stability": "stable",
+    "require": {},
+    "require-dev": {
+        "phpunit/phpunit": "^9.3"
+    },
+    "autoload": {
+        "psr-4": {
+            "ZM\\Config\\": "src/ZM/Config"
+        }
+    }
+}
diff --git a/src/ZM/Config/ZMConfig.php b/src/ZM/Config/ZMConfig.php
new file mode 100644
index 0000000..26faa4b
--- /dev/null
+++ b/src/ZM/Config/ZMConfig.php
@@ -0,0 +1,86 @@
+<?php
+
+
+namespace ZM\Config;
+
+
+class ZMConfig
+{
+    private static $path = ".";
+
+    private static $env = "";
+
+    private static $config = [];
+
+    public static $last_error = "";
+
+    public static function setDirectory($path = ".")
+    {
+        return self::$path = realpath($path);
+    }
+
+    public static function env($env = "")
+    {
+        self::$env = $env;
+    }
+
+    public static function get($name, $key = null)
+    {
+        if (isset(self::$config[$name])) $r = self::$config[$name];
+        else $r = self::loadConfig($name);
+        if($r === false) return false;
+        if($key !== null) return $r[$key] ?? null;
+        else return $r;
+    }
+
+    private static function loadConfig($name)
+    {
+        $ext = [".php", ".json"];
+        $env = ["", ".development", ".staging", ".production"];
+        foreach ($ext as $ext_name) {
+            if (self::$env === '') {
+                foreach ($env as $env_name) {
+                    if (file_exists(self::$path . "/" . $name . $env_name . $ext_name)) {
+                        return self::storeConfig($name, self::$path . "/" . $name . $env_name . $ext_name, $ext_name);
+                    }
+                }
+            } else {
+                if (file_exists(self::$path . "/" . $name . "." . self::$env . $ext_name)) {
+                    return self::storeConfig($name, self::$path . "/" . $name . "." . self::$env . $ext_name, $ext_name);
+                } elseif (file_exists(self::$path . "/" . $name . $ext_name)) {
+                    return self::storeConfig($name, self::$path . "/" . $name . $ext_name, $ext_name);
+                } else {
+                    self::$last_error = "你已指定环境 '" . self::$env . "', 但是配置文件 " . $name . "." . self::$env . "(.php/.json) 不存在，请检查";
+                    return false;
+                }
+            }
+        }
+        self::$last_error = "未找到名称为 " . $name . " 的config文件，请检查文件名后缀是否为 \"json\" 或 \"php\"。";
+        return false;
+    }
+
+    private static function storeConfig($name, $string, $ext_name)
+    {
+        switch ($ext_name) {
+            case ".php":
+                $r = include_once $string;
+                if (is_array($r)) {
+                    return self::$config[$name] = $r;
+                } else {
+                    self::$last_error = "php配置文件include失败，请检查终端warning错误";
+                    return false;
+                }
+            case ".json":
+                $r = json_decode(file_get_contents($string), true);
+                if (is_array($r)) {
+                    return self::$config[$name] = $r;
+                } else {
+                    self::$last_error = "json反序列化失败，请检查文件内容";
+                    return false;
+                }
+            default:
+                self::$last_error = "内部错误";
+                return false;
+        }
+    }
+}
diff --git a/test/ZMConfigTest.php b/test/ZMConfigTest.php
new file mode 100644
index 0000000..d9bc2de
--- /dev/null
+++ b/test/ZMConfigTest.php
@@ -0,0 +1,40 @@
+<?php
+
+
+use PHPUnit\Framework\TestCase;
+use ZM\Config\ZMConfig;
+
+class ZMConfigTest extends TestCase
+{
+    public function setUp(): void
+    {
+        ZMConfig::setDirectory(__DIR__ . "/config");
+    }
+
+    public function testGet()
+    {
+        $this->assertIsArray(ZMConfig::get("test"));
+    }
+
+    public function testEnvSetting()
+    {
+        ZMConfig::env("production");
+        $this->assertEquals("production", ZMConfig::get("test")["hello"]);
+    }
+
+    public function testNonExistEnv()
+    {
+        ZMConfig::env("development");
+        $this->assertIsBool(ZMConfig::get("test"));
+    }
+
+    public function testGetKey() {
+        $this->assertEquals("world", ZMConfig::get("test", "hello"));
+        $this->assertNull(ZMConfig::get("test", "qwe"));
+    }
+
+    public function testJson() {
+        $this->assertIsArray(ZMConfig::get("global"));
+        $this->assertEquals("test", ZMConfig::get("global", "name"));
+    }
+}
diff --git a/test/config/global.json b/test/config/global.json
new file mode 100644
index 0000000..600e5f1
--- /dev/null
+++ b/test/config/global.json
@@ -0,0 +1,3 @@
+{
+  "name": "test"
+}
diff --git a/test/config/test.production.php b/test/config/test.production.php
new file mode 100644
index 0000000..417a0ba
--- /dev/null
+++ b/test/config/test.production.php
@@ -0,0 +1,5 @@
+<?php
+
+$config["hello"] = "production";
+
+return $config;
diff --git a/test/config/test.staging.php b/test/config/test.staging.php
new file mode 100644
index 0000000..a792f9b
--- /dev/null
+++ b/test/config/test.staging.php
@@ -0,0 +1,5 @@
+<?php
+
+$config["hello"] = "world";
+
+return $config;