public function suzgec($metin)
{
    $trans = array("'" => "", "\"" => "");
    $metin = strtr($metin, $trans);
    $metin = strip_tags($metin);

    $dizi = array_count_values(explode(' ', $metin));
    arsort($dizi);
    $yeniDizi = array();

    foreach ($dizi as $key => $value)
    {
        if (empty($key))
        {
            continue;
        }
        $yeniDizi[] = array($value, $key);
    }

    $keywords = array();
    foreach ($yeniDizi as $value)
    {
        if ($value['0'] >= 3)
        {
            $keywords[] = $value['1'];
        }

    }
    return implode(",", $keywords);

}