PHPのクロージャで $this を使う方法 ref: http://qiita.com/items/2810

file0.php

<?php

class Foo
{
    public function getClosure()
    {
        $that = $this;

        $closure = function() use ($that) {
            $that->bar();
        };

        return $closure;
    }

    public function bar()
    {
        echo 'Called bar method.', PHP_EOL;
    }
}

$foo = new Foo();
$closure = $foo->getClosure();
$closure(); // Called bar method.