Function for getting random word from words in brackets

function randomWords($paragraph){ //get one from the words in {}

        preg_match_all('/{(.*?)}/s', $paragraph, $matches);

        foreach($matches[1] as $variations){

            $variations_array = explode('|',$variations);

            $paragraph = str_ireplace('{'.$variations.'}',$variations_array[array_rand($variations_array)],$paragraph);

        }

        return $paragraph;

    }