Cut Word PHP

function word_limiter($str, $limit = 100)
{
		if (trim($str) == '')
		{
			return $str;
		}
 
		preg_match('/^\s*+(?:\S++\s*+){1,'.(int) $limit.'}/', $str, $matches);
 
		if (strlen($str) == strlen($matches[0]))
		{
			$end_char = '';
		}
 
		return rtrim($matches[0]);
}
 
 
function excerpt($full_text, $num_word=100, $allowable_tags='')
{
      $strip = strip_tags($full_text, $allowable_tags);
      if(count($strip) > 0){
        $result = word_limiter($strip, $num_word);     
      }else{
        $result = $strip;
      }
  	return $result;
}