DataObject.php

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<?php
namespace Magento\Framework\Convert;

class DataObject
{
    const CYCLE_DETECTED_MARK = '*** CYCLE DETECTED ***';

    public function convertDataToArray($data)
    {
        $result = [];
        foreach ($data as $key => $value) {
            if (is_object($value) || is_array($value)) {
                $result[$key] = $this->_convertObjectToArray($value);
            } else {
                $result[$key] = $value;
            }
        }
        return $result;
    }

    protected function _convertObjectToArray($obj, &$objects = [])
    {
        $data = [];
        if (is_object($obj)) {
            $hash = spl_object_hash($obj);
            if (!empty($objects[$hash])) {
                return self::CYCLE_DETECTED_MARK;
            }
            $objects[$hash] = true;
            if ($obj instanceof \Magento\Framework\DataObject) {
                $data = $obj->getData();
            } else {
                $data = (array)$obj;
            }
        } elseif (is_array($obj)) {
            $data = $obj;
        }

        $result = [];
        foreach ($data as $key => $value) {
            if (is_scalar($value)) {
                $result[$key] = $value;
            } elseif (is_array($value)) {
                $result[$key] = $this->_convertObjectToArray($value, $objects);
            } elseif ($value instanceof \Magento\Framework\DataObject) {
                $result[$key] = $this->_convertObjectToArray($value, $objects);
            }
        }
        return $result;
    }

    public function toOptionArray(array $items, $idField, $valueField)
    {
        $options = [];
        foreach ($items as $item) {
            $options[] = [
                'value' => $this->_invokeGetter($item, $idField),
                'label' => $this->_invokeGetter($item, $valueField),
            ];
        }
        return $options;
    }

    public function toOptionHash(array $items, $idField, $valueField)
    {
        $options = [];
        foreach ($items as $item) {
            $options[$this->_invokeGetter($item, $idField)] = $this->_invokeGetter($item, $valueField);
        }
        return $options;
    }

    protected function _invokeGetter($item, $field)
    {
        if (is_callable($field)) {
            // if $field is a closure, use that on the item
            return $field($item);
        } else {
            // otherwise, turn it into a call to the item's getter method
            $methodName = 'get' . str_replace(' ', '', ucwords(str_replace('_', ' ', $field)));
            return $item->{$methodName}();
        }
    }
}