GridPerPage.php

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<?php
namespace Magento\Catalog\Model\Config\Source;

class GridPerPage implements \Magento\Framework\Option\ArrayInterface
{
    protected $_options;

    public function __construct($perPageValues)
    {
        $this->_options = explode(',', $perPageValues);
    }

    public function toOptionArray()
    {
        $result = [];
        foreach ($this->_options as $option) {
            $result[] = ['value' => $option, 'label' => $option];
        }
        return $result;
    }
}