<?php

class Foo
{
    private $value;
    
    public function __construct($value)
    {
        $this->value = $value;
    }
}

$foo = new Foo('string');

// Instead of bind to closure you can use call in php 7
$closure = function() {
    return md5($this->value);
};

dump($closure->call($foo));


^ "b45cffe084dd3d20d928bee85e7b0f21"

• Access data of Traversable with IteratorIterator
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PHP 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8