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<?php //Title of this code
    function extractCommonWords($string){
        $stopWords = array('i','a','about','an','and','are','as','at','be','by','com','de','en','for','from','how','in','is','it','la','of','on','or','that','the','this','to','was','what','when','where','who','will','with','und','the','www');
        
        $string = strtolower($string);
        
        preg_match_all('/\w+/u', $string, $matchWords);
        $matchWords = $matchWords[0];
        
        foreach ( $matchWords as $key=>$item ) {
          if ( $item == '' || in_array(strtolower($item), $stopWords) || strlen($item) <= 3 ) {
              unset($matchWords[$key]);
          }
        }   
        $wordCountArr = array();
        if ( is_array($matchWords) ) {
          foreach ( $matchWords as $key => $val ) {
              $val = mb_strtolower($val);
              if ( isset($wordCountArr[$val]) ) {
                  $wordCountArr[$val]++;
              } else {
                  $wordCountArr[$val] = 1;
              }
          }
        }
        
        arsort($wordCountArr);
        $wordCountArr = array_slice($wordCountArr, 0, 10);
        return $wordCountArr;
    }
    
    
    //for testing purposes
    $sc = 'Hello there нам для!';
    $result = extractCommonWords($sc);
    print_r($result);
    
?>

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