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<?php

/*

    AUTOMATIC IMAGE ROTATOR
    Version 2.2 - December 4, 2003
    Copyright (c) 2002-2003 Dan P. Benjamin, Automatic, Ltd.
    All Rights Reserved.

    http://www.hiveware.com/imagerotator.php

    http://www.automaticlabs.com/


    DISCLAIMER
    Automatic, Ltd. makes no representations or warranties about
    the suitability of the software, either express or
    implied, including but not limited to the implied
    warranties of merchantability, fitness for a particular
    purpose, or non-infringement. Dan P. Benjamin and Automatic, Ltd.
    shall not be liable for any damages suffered by licensee
    as a result of using, modifying or distributing this
    software or its derivatives.


    ABOUT
    This PHP script will randomly select an image file from a
    folder of images on your webserver.  You can then link to it
    as you would any standard image file and you'll see a random
    image each time you reload.

    When you want to add or remove images from the rotation-pool,
    just add or remove them from the image rotation folder.


    VERSION CHANGES
    Version 1.0
        - Release version

    Version 1.5
        - Tweaked a few boring bugs

    Version 2.0
        - Complete rewrite from the ground-up
        - Made it clearer where to make modifications
        - Made it easier to specify/change the rotation-folder
        - Made it easier to specify/change supported image types
        - Wrote better instructions and info (you're them reading now)
        - Significant speed improvements
        - More error checking
        - Cleaner code (albeit more PHP-specific)
        - Better/faster random number generation and file-type parsing
        - Added a feature where the image to display can be specified
        - Added a cool feature where, if an error occurs (such as no
          images being found in the specified folder) *and* you're
          lucky enough to have the GD libraries compiled into PHP on
          your webserver, we generate a replacement "error image" on
          the fly.

    Version 2.1
        - Updated a potential security flaw when value-matching
          filenames

    Version 2.2
        - Updated a few more potential security issues
        - Optimized the code a bit.
        - Expanded the doc for adding new mime/image types.

        Thanks to faithful ALA reader Justin Greer for
        lots of good tips and solid code contribution!


    INSTRUCTIONS
    1. Modify the $folder setting in the configuration section below.
    2. Add image types if needed (most users can ignore that part).
    3. Upload this file (rotate.php) to your webserver.  I recommend
       uploading it to the same folder as your images.
    4. Link to the file as you would any normal image file, like this:

            <img src="http://example.com/rotate.php">

    5. You can also specify the image to display like this:

            <img src="http://example.com/rotate.php?img=gorilla.jpg">

        This would specify that an image named "gorilla.jpg" located
        in the image-rotation folder should be displayed.

    That's it, you're done.

*/




/* ------------------------- CONFIGURATION -----------------------


    Set $folder to the full path to the location of your images.
    For example: $folder = '/user/me/example.com/images/';
    If the rotate.php file will be in the same folder as your
    images then you should leave it set to $folder = '.';

*/


    $folder = '.';


/*

    Most users can safely ignore this part.  If you're a programmer,
    keep reading, if not, you're done.  Go get some coffee.

    If you'd like to enable additional image types other than
    gif, jpg, and png, add a duplicate line to the section below
    for the new image type.

    Add the new file-type, single-quoted, inside brackets.

    Add the mime-type to be sent to the browser, also single-quoted,
    after the equal sign.

    For example:

    PDF Files:

        $extList['pdf'] = 'application/pdf';

    CSS Files:

        $extList['css'] = 'text/css';

    You can even serve up random HTML files:

        $extList['html'] = 'text/html';
        $extList['htm'] = 'text/html';

    Just be sure your mime-type definition is correct!

*/

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



// You don't need to edit anything after this point.


// --------------------- END CONFIGURATION -----------------------

$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);
    }
}

?>