Include subfolders in random image script

[4fit?]

How would I go about editing this script so that it would include subfolders in the image list? Currently, it just gets all of the images from the same folder the file is in. I can tweak it to get them from a different folder with no problem. But I am building a website (my first with PHP) for an auto repair business and they are going to be placing their images into different folders depending on what is being done to the automobile. All of these subfolders will be placed in a parent folder called repair_images. My goal is to randomly pick an image(s) from the repair_images folder and it's subfolders.

Also, if there is a better way of doing this, please let me know and give me an example.

Any help is greatly appreciated.

<?php
    $folder = '.';

    $extList = array();
        $extList['gif'] = 'image/gif';
        $extList['jpg'] = 'image/jpeg';
        $extList['jpeg'] = 'image/jpeg';
        $extList['png'] = 'image/png';
    
    $img = null;

    if (substr($folder,-1) != '/') {
        $folder = $folder.'/';
    }

    if (isset($_GET['img'])) {
        $imageInfo = pathinfo($_GET['img']);
        if (
            isset( $extList[ strtolower( $imageInfo['extension'] ) ] ) &&
            file_exists( $folder.$imageInfo['basename'] )
        ) {
            $img = $folder.$imageInfo['basename'];
        }
    } else {
        $fileList = array();
        $handle = opendir($folder);
        while ( false !== ( $file = readdir($handle) ) ) {
            $file_info = pathinfo($file);
            if (
                isset( $extList[ strtolower( $file_info['extension'] ) ] )
            ) {
                $fileList[] = $file;
            }
        }
        closedir($handle);

        if (count($fileList) > 0) {
            $imageNumber = time() % count($fileList);
            $img = $folder.$fileList[$imageNumber];
        }
    }

    if ($img!=null) {
        $imageInfo = pathinfo($img);
        $contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ];
        header ($contentType);
        readfile($img);
    } else {
        if ( function_exists('imagecreate') ) {
            header ("Content-type: image/png");
            $im = @imagecreate (100, 100)
                or die ("Cannot initialize new GD image stream");
            $background_color = imagecolorallocate ($im, 255, 255, 255);
            $text_color = imagecolorallocate ($im, 0,0,0);
            imagestring ($im, 2, 5, 5,  "IMAGE ERROR", $text_color);
            imagepng ($im);
            imagedestroy($im);
        }
    }

?>

[4fit?]

Bump.

Any ideas?

[4fit?]

OK. I have it now cycling through the parent directory and it's subfolders to grab the random image. Now, how can I tweak this so that is searches for a files with a paraticular filename? I want to search for only the files that begin with "t_", regardless of their extension, so I know that I need to use "t_*", but I'm not sure how/where to place that filter.

<?php

    // files to search for
    $extList = array();
        $extList['gif'] = 'image/gif';
        $extList['jpg'] = 'image/jpeg';
        $extList['jpeg'] = 'image/jpeg';
        $extList['png'] = 'image/png';

    // set to specific image if needed
    // null will result in a random image
    $img = null;
    
    // path to the directory you want to scan
    $directory = './';
    if (substr($directory,-1) != '/') {
        $directory = $directory.'/';
    }

    // if img is set, show it
    if (isset($_GET['img'])) {
        $imageInfo = pathinfo($_GET['img']);
        if (
            isset( $extList[ strtolower( $imageInfo['extension'] ) ] ) &&
            file_exists( $directory.$imageInfo['basename'] )
        ) {
            $img = $directory.$imageInfo['basename'];
        }
    } 
    // if img isnt set, grab a random
    else {
        //cycle through directory and subfolders
        $it = new RecursiveDirectoryIterator("$directory");
        foreach(new RecursiveIteratorIterator($it) as $file)
        {
            $file_info = pathinfo($file);
            if (
                isset( $extList[ strtolower( $file_info['extension'] ) ] )
            ) {
                $items[] = $file;
            }
        }
        sort($items);
        // get the random image
        if (count($items) > 0) {
            $imageNumber = time() % count($items);
            $img = $directory.$items[$imageNumber];
        }
    }

    // if img isnt null, display it
    if ($img!=null) {
        $imageInfo = pathinfo($img);
        $contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ];
        header ($contentType);
        readfile($img);
    } 
    // else, try to create one or give error
    else {
        if ( function_exists('imagecreate') ) {
            header ("Content-type: image/png");
            $im = @imagecreate (100, 100)
                or die ("Cannot initialize new GD image stream");
            $background_color = imagecolorallocate ($im, 255, 255, 255);
            $text_color = imagecolorallocate ($im, 0,0,0);
            imagestring ($im, 2, 5, 5,  "IMAGE ERROR", $text_color);
            imagepng ($im);
            imagedestroy($im);
        }
    }
?>

[4fit?]

OK. Just realized a problem. Currently, the script above is stored in a file called rotator.php. In the file where I want the random image to appear, I just set the src property of the img tag equal to the path to the rotator.php file. This works fine if all I want to do is show a random image, but what I really want it to do is show the random thumbnail image and have it set as a link to the fullsize image. So using it as the source of the img tag is not gonna work.

I tried tweaking the header content-type to text/html and using require_once in the file where I want it to appear, but it is giving me an error message of "Cannot modify header information.....".

So, what would I need to do to make to code in the post above be able to be used as a require_once file and output something like:
echo '<a href="' . $img . '"><img src="' . $imgThumb . 'alt="" /></a>';

Thanks in advance!

[4fit?]

Alright. I got the issue handled so that it allws me to use a require statement and have the image display in the page. This give me the ability to pull an image and have it link to another image.

So, the only thing I have left to figure out is how to make it just pull the thumbnail images which all have "t_" as the first characters of the filename. I tried using a strpos statement, but that searches the whole basename. I just want to search the 1st 2 characters.