Callback.php

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<?php
namespace Magento\Framework\Validator\Constraint\Option;

class Callback implements \Magento\Framework\Validator\Constraint\OptionInterface
{
    protected $_callable;

    protected $_arguments;

    protected $_createInstance;

    public function __construct($callable, $arguments = null, $createInstance = false)
    {
        $this->_callable = $callable;
        $this->setArguments($arguments);
        $this->_createInstance = $createInstance;
    }

    public function setArguments($arguments = null)
    {
        if (is_array($arguments)) {
            $this->_arguments = $arguments;
        } elseif (null !== $arguments) {
            $this->_arguments = [$arguments];
        } else {
            $this->_arguments = null;
        }
    }

    public function getValue()
    {
        $callable = $this->_callable;

        if (is_array($callable) && isset($callable[0]) && is_string($callable[0])) {
            if (!class_exists($callable[0])) {
                throw new \InvalidArgumentException(sprintf('Class "%s" was not found', $callable[0]));
            }
            if ($this->_createInstance) {
                $callable[0] = new $callable[0]();
            }
        } elseif ($this->_createInstance) {
            throw new \InvalidArgumentException('Callable expected to be an array with class name as first element');
        }

        if (!is_callable($callable)) {
            throw new \InvalidArgumentException('Callback does not callable');
        }

        if ($this->_arguments) {
            return call_user_func_array($callable, $this->_arguments);
        } else {
            return call_user_func($callable);
        }
    }
}