add toArray api to access token

Author: Adam Rodriguez

src/Token/AccessToken.php

@@ -22,7 +22,7 @@
  *
  * @link http://tools.ietf.org/html/rfc6749#section-1.4 Access Token (RFC 6749, §1.4)
  */
-class AccessToken implements AccessTokenInterface, ResourceOwnerAccessTokenInterface
+class AccessToken implements AccessTokenInterface, ResourceOwnerAccessTokenInterface, ArrayableAccessTokenInterface
 {
     /**
      * @var string
@@ -214,11 +214,11 @@ public function __toString()
     {
         return (string) $this->getToken();
     }
-
+    
     /**
      * @inheritdoc
      */
-    public function jsonSerialize()
+    public function toArray()
     {
         $parameters = $this->values;
 
@@ -240,4 +240,12 @@ public function jsonSerialize()
 
         return $parameters;
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }

src/Token/ArrayableAccessTokenInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace League\OAuth2\Client\Token;
+
+use ReturnTypeWillChange;
+
+interface ArrayableAccessTokenInterface
+{
+    /**
+     * Returns an array of parameters provided to the access token
+     * 
+     * @return array
+     */
+    #[ReturnTypeWillChange]
+    public function toArray();
+}