FieldArray.php

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<?php
namespace Magento\Config\Block\System\Config;

use Magento\Config\Block\System\Config\Form\Field\FieldArray\AbstractFieldArray;

class FieldArray extends AbstractFieldArray
{
    protected function _toHtml()
    {
        $value = '';
        $element = $this->getElement();
        if ($element->getValue() && is_array($element->getValue())) {
            $value = implode('|', $element->getValue());
        }

        return sprintf(
            '<input id="%s" name="%s" value="%s" />',
            $element->getId(),
            $element->getName(),
            $value
        );
    }
}