PHP add methods to Functions
<?
function func(){
    ;
}
//add method
func->test = function(){
    ;
}

func->test();
func();

class myfunc_class{
    function __invoke(){
            //function body
    }
    function __call($closure, $args)
    {
        call_user_func_array($this->$closure, $args);
    }
}
$func = new myfunc_class;

$func->test = function(){
    echo '<br>test<br>';
};

$func->test();
$func();

class func{
    public $_function;
    function __invoke(){
        return call_user_func_array($this->_function,func_get_args());
    }
    function __construct($fun){
        $this->_function = $fun;
    }
    function __call($closure, $args)
    {
        call_user_func_array($this->$closure, $args);
    }
}
$func = new func(function($value){
    echo $value;
});

$func->method = function(){
    echo '<br>test<br>';
};

$func('someValue');
$func->method();

class func
{

    function __call($func, $args)
    {
        return call_user_func_array($this->$func, $args);
    }

}


$obj = new func;

$obj->test = function($param1, $param2)
{
    return $param1 + $param2;
};

echo $obj->test(1,1);

// function_object.php
<?php

class FunctionObject {

   public method func() {
       // do stuff

   }

}

?>

<?php

// example.php in same folder as function_object.php
include 'function_object.php';

$FuncObj = new FunctionObject;
$FuncObj->func();

class myClass {
}

class myClass {
  function test() {
    echo "test!n";
  }
}

$class = new myClass;
$class->test();

function a() {
    function b() { echo 'Hi'; }
}
a();
b();
Output: HiHi

function a() {
    function b() { echo 'Hi'; }
}
b();
Output: ERROR