Add getCookieParam method

Slim/Http/Request.php

@@ -684,6 +684,27 @@ public function getCookieParams()
         return $this->cookies;
     }
 
+    /**
+     * Fetch cookie value from cookies sent by the client to the server.
+     *
+     * Note: This method is not part of the PSR-7 standard.
+     *
+     * @param     $key
+     * @param null $default
+     *
+     * @return null
+     */
+    public function getCookieParam($key, $default = null)
+    {
+        $getCookies = $this->getCookieParams();
+        $result = $default;
+        if (isset($getCookies[$key])) {
+            $result = $getCookies[$key];
+        }
+
+        return $result;
+    }
+
     /**
      * Return an instance with the specified cookies.
      *

tests/Http/RequestTest.php

@@ -512,6 +512,20 @@ public function testGetContentLengthWithoutHeader()
      * Cookies
      ******************************************************************************/
 
+    public function testGetCookieParam()
+    {
+        $shouldBe = 'john';
+
+        $this->assertEquals($shouldBe, $this->requestFactory()->getCookieParam('user'));
+    }
+
+    public function testGetCookieParamWithDefault()
+    {
+        $shouldBe = 'bar';
+
+        $this->assertEquals($shouldBe, $this->requestFactory()->getCookieParam('foo', 'bar'));
+    }
+
     public function testGetCookieParams()
     {
         $shouldBe = [