php get hashtags of string

metodo para extraer hashtags desde una cadena de texto en php



function get_hashtags($cadena, $str = 1) {
$filtros= "";
preg_match_all('/#(\w+)/',$cadena,$matches);
 $i = 0;
 if ($str) {
  foreach ($matches[1] as $match) {
  $count = count($matches[1]);
  $filtros .= "$match";
  $i++;
  if ($count > $i) $filtros .= ",";
 }
} else {
  foreach ($matches[1] as $match) {
$keyword[] = $match;
  }
 $filtros = $keyword;
}
return $filtros;
}