$hostdir=dirname(__FILE__).'/data/upload/admin/20170517/';
$url = '/data/upload/admin/20170517/';
$filesnames = scandir($hostdir);
$www = 'http://www.***.com/';
foreach ($filesnames as $name) {
$aurl= "<img width='100' height='100' src='".$www.$url.$name."' alt = '".$name."'>";
echo $aurl . "<br/>";
}