php cURL options help

I need print output of this function to user, but sometimes I get .pdf files and I not need print .pdf I put a filter in $strURL for not process the URL if end in .pdf but sometimes I need processing URLs that redirect to .pdf files (ex: [login to view URL]) and I can't put CURLOPT_FOLLOWLOCATION to 0 function sGetBuffer( $strURL, $strREFERER ) { if(substr( $strURL, -4) == '.pdf')) return; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $strURL); curl_setopt($ch, CURLOPT_REFERER, $strREFERER); curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; rv:16.0) Gecko/20100101 Firefox/16.0"); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); curl_setopt($ch, CURLOPT_TIMEOUT, 100); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept-Language: en-us,en;q=0.5")); $output = curl_exec($ch); curl_close($ch); return $output; } Exists an option for filter format files in php for cURL ? Thanks in advanced.