<?php
$files = scandir("./"); 	
     for ($i=0; $i<count($files); $i++)
      {
        $image = $files[$i];
        $supported_file = array(
                'gif',
                'jpg',
                'jpeg',
                'png'
         );

         $ext = strtolower(pathinfo($image, PATHINFO_EXTENSION));
         if (in_array($ext, $supported_file)) {
            echo basename($image)."<br />"; // show only image name if you want to show full path then use this code // echo $image."<br />";
             echo '<a href="'.$image .'" target="_foto_' . $i . '"><img style="width:400px;" src="'.$image .'" /></a>'."<br /><br />";
            } else {
                continue;
            }
          }
       ?>