如何在嵌套函数中使用类属性

Question

Why a class property is not accessible in the nested function ? So how do I use it?

class MyClass
{
    public $var = "I'm a class property!";

    public function Test()
    {
        function SubTest()
        {
          // I need to $this->var; here
        }
    }

}

I want to echo $var in the SubTest() . Is it possible ?

Answer 1

What about doing this?

<?php
class MyClass{

    public $var = "I'm a class property!";

    public function Test(){
        function SubTest(&$father){
            $father->var = 'something else';
            echo 'here ! '.$father->var.'<br />';
        }
        echo $this->var.'<br />';
        SubTest($this);
        echo $this->var.'<br />';
    }
}

$test = new MyClass();
echo $test->var.'<br />';
$test->Test();

?>

Gives this result:

I'm a class property!
I'm a class property!
here ! something else
something else

Answer 2

How about using a closure? $this is visible inside the closure since PHP 5.4.

And besides that you should not be defining a function inside a method like this. PHP functions are global, means they behave in exactly the same way as if they had been declared outside.

class MyClass
{
    public $var = "I'm a class property!";

    public function Test($str)
    {   

        $callback = function() use ($str)
        {
            print_r($this->var . " " .  $str);

        };

        return call_user_func($callback);
    }

}

$a = new MyClass();
$a->Test("My name is not Foo.");