PageLayout.php

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<?php
namespace Magento\Cms\Model\Page\Source;

use Magento\Framework\Data\OptionSourceInterface;
use Magento\Framework\View\Model\PageLayout\Config\BuilderInterface;

class PageLayout implements OptionSourceInterface
{
    protected $pageLayoutBuilder;

    protected $options;

    public function __construct(BuilderInterface $pageLayoutBuilder)
    {
        $this->pageLayoutBuilder = $pageLayoutBuilder;
    }

    public function toOptionArray()
    {
        if ($this->options !== null) {
            return $this->options;
        }

        $configOptions = $this->pageLayoutBuilder->getPageLayoutsConfig()->getOptions();
        $options = [];
        foreach ($configOptions as $key => $value) {
            $options[] = [
                'label' => $value,
                'value' => $key,
            ];
        }
        $this->options = $options;

        return $this->options;
    }
}