diff --git a/src/Cookie.php b/src/Cookie.php
index 4dc38e3..3a3b7d7 100644
--- a/src/Cookie.php
+++ b/src/Cookie.php
@@ -47,7 +47,7 @@ class Cookie {
             return false;
         }
 
-        $expires = ( $expires === 0 ) ? 0 : time() + (int) $expires;
+        $expires = ! $expires ? 0 : time() + (int) $expires;
 
         $_COOKIE[$name] = $value;
 
@@ -80,10 +80,14 @@ class Cookie {
         }
 
         if ( $this->secureHash && ! $skipHash ) {
+            if (strpos($_COOKIE[$key], '|') === false) {
+                throw new Exception\CookieInvalidValueException("A cookie value was found which contains no secure hash while a key was provided.");
+            }
+
             list($hash, $value) = explode('|', $_COOKIE[$key], 2);
 
             if (! $this->isSecure($hash, $value)) {
-                throw new Exception\CookieInvalidSecureHashException();
+                throw new Exception\CookieInvalidSecureHashException("Invalid cookie hash value given.");
             }
 
             return $value;
@@ -126,4 +130,24 @@ class Cookie {
             case 2: return $this->set(...$arguments);
         }
     }
+
+    public function __set($key, $value)
+    {
+        return static::set($key, $value);
+    }
+
+    public function __get($key)
+    {
+        return static::get($key);
+    }
+
+    public function __isset($key)
+    {
+        return array_key_exists($key, $_SESSION);
+    }
+
+    public function __unset($key)
+    {
+        $this->delete($key);
+    }
 }