SplitWords.php

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<?php
namespace Magento\Framework\Filter;

class SplitWords implements \Zend_Filter_Interface
{
    protected $uniqueOnly;

    protected $wordsQty;

    protected $wordSeparatorRegexp;

    public function __construct($uniqueOnly = true, $wordsQty = 0, $wordSeparatorRegexp = '\s')
    {
        $this->uniqueOnly = $uniqueOnly;
        $this->wordsQty = $wordsQty;
        $this->wordSeparatorRegexp = $wordSeparatorRegexp;
    }

    public function filter($str)
    {
        $result = [];
        $split = preg_split('#' . $this->wordSeparatorRegexp . '#siu', $str, null, PREG_SPLIT_NO_EMPTY);
        foreach ($split as $word) {
            if ($this->uniqueOnly) {
                $result[$word] = $word;
            } else {
                $result[] = $word;
            }
        }
        if ($this->wordsQty && count($result) > $this->wordsQty) {
            $result = array_slice($result, 0, $this->wordsQty);
        }
        return $result;
    }
}