Placeholder.php

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<?php
namespace Magento\Framework\Phrase\Renderer;

use Magento\Framework\Phrase\RendererInterface;

class Placeholder implements RendererInterface
{
    public function render(array $source, array $arguments)
    {
        $text = end($source);

        if ($arguments) {
            $placeholders = array_map([$this, 'keyToPlaceholder'], array_keys($arguments));
            $pairs = array_combine($placeholders, $arguments);
            $text = strtr($text, $pairs);
        }

        return $text;
    }

    private function keyToPlaceholder($key)
    {
        return '%' . (is_int($key) ? (string)($key + 1) : $key);
    }
}