bitLy.class.php

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<?php
class helper_bitLy extends object {

        protected function getDefPrm() {
                return $this->cfg->param;
        }

        protected function doAction($action, array $prm) {
                $prm = array_merge($this->getDefPrm(), $prm);
                $url = $this->cfg->url.$action.'?';
                foreach($prm as $k=>$v)
                        $url.= $k.'='.$v.'&';
                $content = file_get_contents($url);
                if ($content)
                        return json_decode($content);
        }

        public function shorten($longUrl) {
                $content = $this->doAction('shorten', array('longUrl'=>$longUrl));
                if ($content->statusCode == 'OK') {
                        return $content->results->$longUrl->shortUrl;
                }
                return null;
        }

}