src/Linguistics.php
public function getKeywords($string, $amount = 10)
    {
        $words = $this->getWords($string);

        $analysis = new FrequencyAnalysis($words);

        $keywords = $analysis->getKeyValuesByFrequency();

        return array_slice($keywords, 0, $amount);
    }
public function getKeywords($string, $amount = 10)
    {
        $words = $this->getWords($string);

        $analysis = new FrequencyAnalysis($words);

        $keywords = $analysis->getKeyValuesByFrequency();

        return array_slice($keywords, 0, $amount);
    }
Get keywords.

@param string $string
@param int    $amount

@return array