up: update readme and add some new methods

Author: inhere

README.md

@@ -1,7 +1,7 @@
 # INI
 
-[![License](https://img.shields.io/packagist/l/phppkg/ini.svg?style=flat-square)](LICENSE)
-[![Php Version](https://img.shields.io/badge/php-%3E=7.2.0-brightgreen.svg?maxAge=2592000)](https://packagist.org/packages/phppkg/ini)
+[![License](https://img.shields.io/github/license/phppkg/ini?style=flat-square)](LICENSE)
+[![Php Version](https://img.shields.io/packagist/php-v/phppkg/ini?maxAge=2592000)](https://packagist.org/packages/phppkg/ini)
 [![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/phppkg/ini)](https://github.com/phppkg/ini)
 [![Actions Status](https://github.com/phppkg/ini/workflows/Unit-Tests/badge.svg)](https://github.com/phppkg/ini/actions)
 
@@ -14,6 +14,7 @@
 - enhance: supports inline array value
 - enhance: supports multi inline string. use `'''` or `"""`
 - enhance: supports add interceptor before collect value
+- TODO: support parse ENV var. `${SHELL | bash}`
 
 ## Install
 

src/IniEncoder.php

@@ -11,6 +11,14 @@
  */
 class IniEncoder
 {
+    /**
+     * @return static
+     */
+    public static function new(): self
+    {
+        return new self();
+    }
+
     /**
      * @param array|Traversable $data
      * @param int $flags

src/IniParser.php

@@ -13,7 +13,6 @@
 use function str_starts_with;
 use function strlen;
 use function strpos;
-use function strstr;
 use function substr;
 use function trim;
 
@@ -79,7 +78,7 @@ class IniParser
      *
      * @return static
      */
-    public static function new(string $source): self
+    public static function new(string $source = ''): self
     {
         return new self($source);
     }
@@ -89,7 +88,7 @@ public static function new(string $source): self
      *
      * @param string $source
      */
-    public function __construct(string $source)
+    public function __construct(string $source = '')
     {
         $this->source = $source;
     }
@@ -282,6 +281,28 @@ public function getSource(): string
         return $this->source;
     }
 
+    /**
+     * @param string $source
+     *
+     * @return IniParser
+     */
+    public function setSource(string $source): self
+    {
+        $this->source = $source;
+        return $this;
+    }
+
+    /**
+     * @param callable $interceptor
+     *
+     * @return IniParser
+     */
+    public function addInterceptor(callable $interceptor): self
+    {
+        $this->interceptors[] = $interceptor;
+        return $this;
+    }
+
     /**
      * @param callable[] $interceptors
      *