<?php

class HashTag {

    public static function gethashtags($text) {
        //Match the hashtags
        preg_match_all('/(^|[^a-z0-9_])#([a-z0-9_]+)/i', $text, $matchedHashtags);
        $hashtag = '';
        // For each hashtag, strip all characters but alpha numeric
        if (!empty($matchedHashtags[0])) {
            foreach ($matchedHashtags[0] as $match) {
                $hashtag .= preg_replace("/[^a-z0-9]+/i", "", $match) . ',';
            }
        }
        //to remove last comma in a string
        return rtrim($hashtag, ',');
    }

}
