RandomWordSelector.php

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<?php
namespace Magento\Setup\Model\Description\Mixin\Helper;

class RandomWordSelector
{
    public function getRandomWords($source, $count)
    {
        $words = str_word_count($source, 1);
        if (empty($words)) {
            return [];
        }

        $randWords = [];
        $wordsSize = count($words);
        while ($count) {
            $randWords[] = $words[random_int(0, $wordsSize - 1)];
            $count--;
        }

        return $randWords;
    }
}