<?php

        // open this directory
        $myDirectory = opendir("ss");

        // get each entry
        while($entryName = readdir($myDirectory)) {
            $dirArray[] = $entryName;
        }

        // close directory
        closedir($myDirectory);

        //  count elements in array
        $indexCount = count($dirArray);

        ?>

        <ul>

            <?php
            // loop through the array of files and print them all in a list


            for($index=0; $index < $indexCount; $index++) {
                $extension = substr($dirArray[$index], -3);
                for($i=0; $i<count($images) && $i<4; $i++) {
              // Use $images[$i]
              }
                if ($extension == 'jpg'){ // list only jpgs
                    echo '<li><img class="img" src="ss/' . $dirArray[$index] . '" alt="Image" /><span>' . $dirArray[$index] . '</span>';
                }
            }
            ?>