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diff --git a/zend/functor.h b/zend/functor.h
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+++ b/zend/functor.h
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+/**
+ *  Functor.h
+ *
+ *  We want to be able to wrap a std::function in an object and pass
+ *  that to PHP. The normal "Closure" class from the Zend engine
+ *  would be very suitable for that. However, the Zend engine does
+ *  not really allow us to add a secret pointer to such closure object.
+ *
+ *  Therefore, we create our own Closure class, this time using PHP-CPP
+ *  code, to wrap a std::function.
+ *
+ *  @author Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
+ *  @copyright 2015 Copernica BV
+ */
+
+/**
+ *  Set up namespace
+ */
+namespace Php {
+
+/**
+ *  Class definition
+ */
+class Functor : public Base
+{
+public:
+    /**
+     *  Constructor
+     *  @param  function    The function to wrap
+     */
+    Functor(const std::function<Value(Parameters &params)> &function) : _function(function) {}
+    
+    /**
+     *  Destructor
+     */
+    virtual ~Functor() {}
+    
+    /**
+     *  Invoke the functor
+     *  @param  params
+     *  @return Value
+     */
+    Value __invoke(Parameters &params) const
+    {
+        // pass on to the function
+        return _function(params);
+    }
+
+private:
+    /**
+     *  The std::function that is wrapped in PHP code
+     *  @var std::function
+     */
+    const std::function<Value(Parameters &params)> _function;
+};
+
+/**
+ *  End of namespace
+ */
+}
+