displaying all images randomly from a folder

hi  i have the following code that displays images randomly from a given  folder.
but this code only displays one image at a time. i want to display all the images in the folder so if i have 10 images
i want them to be displayed in a table how can i do that

for example if i have

1.jpg     2.jpg    3.jpg   4.jpg     5.jpg     6.jpg    7.jpg   8.jpg   9.jpg   10.jpg  

this is my code that displays one random image

<?php 
$IMAGE_DIRECTORY = "index_files/";
 
###Nothing below this line should need to be configured.###
$line = "";
$randomNumber= 0;
$imageFiles = array();
$fileName = "";
$x=0;
if ($DIR = opendir($IMAGE_DIRECTORY)) {
        while ($fileName = readdir($DIR)) {
                if (is_dir($IMAGE_DIRECTORY . $fileName)) { continue; }
                if (!preg_match("/\w/", $fileName)) { continue; }
                if (preg_match("/\.gif$|\.jpg$|\.jpeg$/i",$fileName)) {
                        $imageFiles[$x] = $fileName;
                        $x+=1;
                }
        }
        closedir($DIR);
        srand((double)microtime()*1000000);
        $randomNumber = rand(0,(count($imageFiles) - 1));
        Header ("Pragma: no-cache\n");
        if (preg_match("/\.gif$/i",$imageFiles[$randomNumber])) {
                Header ("Content-type: image/gif\n\n");
        } elseif (preg_match("/\.jpg$|\.jpeg$/i",$imageFiles[$randomNumber])) {
                Header ("Content-type: image/jpg\n\n");
        } else { #Not a gif or jpeg file. Exit the program.
                exit;
        }
        $fp = fopen ($IMAGE_DIRECTORY . $imageFiles[$randomNumber], "rb");
        echo (fread($fp,filesize($IMAGE_DIRECTORY . $imageFiles[$randomNumber])));
        fclose($fp);
}
exit;
# random_image.php
?>

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