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<?php |
<?php |
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/* |
/** |
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* randomly select an image from the current directory and return it |
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AUTOMATIC IMAGE ROTATOR |
* |
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Version 2.2 - December 4, 2003 |
* @todo - consider accepting a local path as $_GET['img'] for overrides |
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Copyright (c) 2002-2003 Dan P. Benjamin, Automatic, Ltd. |
* to remain compatible with Marinelli's rotate.php |
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All Rights Reserved. |
* |
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* (but why? why possible use case is there for linking to |
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http://www.hiveware.com/imagerotator.php |
* rotate.php?img=file.gif instead of straight to file.gif?) |
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*/ |
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http://www.automaticlabs.com/ |
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$file_types = array( |
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'gif' => 'image/gif', |
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DISCLAIMER |
'jpg' => 'image/jpeg', |
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Automatic, Ltd. makes no representations or warranties about |
'jpeg' => 'image/jpeg', |
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the suitability of the software, either express or |
'png' => 'image/png' |
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implied, including but not limited to the implied |
) ; |
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warranties of merchantability, fitness for a particular |
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purpose, or non-infringement. Dan P. Benjamin and Automatic, Ltd. |
$regex = '/\.(' . implode('|',array_keys($file_types)) . ')$/i' ; |
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shall not be liable for any damages suffered by licensee |
$files = array() ; |
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as a result of using, modifying or distributing this |
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software or its derivatives. |
$directory = opendir("."); |
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while ( FALSE !== ($file = readdir( $directory )) ) { |
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if ( preg_match( $regex, $file ) ) { |
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ABOUT |
$files[] = $file ; |
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This PHP script will randomly select an image file from a |
} |
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folder of images on your webserver. You can then link to it |
} |
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as you would any standard image file and you'll see a random |
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image each time you reload. |
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When you want to add or remove images from the rotation-pool, |
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just add or remove them from the image rotation folder. |
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VERSION CHANGES |
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Version 1.0 |
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- Release version |
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Version 1.5 |
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- Tweaked a few boring bugs |
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Version 2.0 |
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- Complete rewrite from the ground-up |
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- Made it clearer where to make modifications |
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- Made it easier to specify/change the rotation-folder |
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- Made it easier to specify/change supported image types |
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- Wrote better instructions and info (you're them reading now) |
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- Significant speed improvements |
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- More error checking |
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- Cleaner code (albeit more PHP-specific) |
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- Better/faster random number generation and file-type parsing |
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- Added a feature where the image to display can be specified |
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- Added a cool feature where, if an error occurs (such as no |
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images being found in the specified folder) *and* you're |
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lucky enough to have the GD libraries compiled into PHP on |
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your webserver, we generate a replacement "error image" on |
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the fly. |
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Version 2.1 |
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- Updated a potential security flaw when value-matching |
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filenames |
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Version 2.2 |
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- Updated a few more potential security issues |
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- Optimized the code a bit. |
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- Expanded the doc for adding new mime/image types. |
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Thanks to faithful ALA reader Justin Greer for |
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lots of good tips and solid code contribution! |
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INSTRUCTIONS |
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1. Modify the $folder setting in the configuration section below. |
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2. Add image types if needed (most users can ignore that part). |
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3. Upload this file (rotate.php) to your webserver. I recommend |
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uploading it to the same folder as your images. |
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4. Link to the file as you would any normal image file, like this: |
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<img src="http://example.com/rotate.php"> |
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5. You can also specify the image to display like this: |
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<img src="http://example.com/rotate.php?img=gorilla.jpg"> |
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This would specify that an image named "gorilla.jpg" located |
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in the image-rotation folder should be displayed. |
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That's it, you're done. |
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*/ |
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/* ------------------------- CONFIGURATION ----------------------- |
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Set $folder to the full path to the location of your images. |
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For example: $folder = '/user/me/example.com/images/'; |
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If the rotate.php file will be in the same folder as your |
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images then you should leave it set to $folder = '.'; |
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*/ |
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$folder = '.'; |
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/* |
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Most users can safely ignore this part. If you're a programmer, |
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keep reading, if not, you're done. Go get some coffee. |
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If you'd like to enable additional image types other than |
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gif, jpg, and png, add a duplicate line to the section below |
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for the new image type. |
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Add the new file-type, single-quoted, inside brackets. |
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Add the mime-type to be sent to the browser, also single-quoted, |
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after the equal sign. |
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For example: |
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PDF Files: |
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$extList['pdf'] = 'application/pdf'; |
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CSS Files: |
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$extList['css'] = 'text/css'; |
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You can even serve up random HTML files: |
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$extList['html'] = 'text/html'; |
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$extList['htm'] = 'text/html'; |
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Just be sure your mime-type definition is correct! |
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*/ |
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$extList = array(); |
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$extList['gif'] = 'image/gif'; |
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$extList['jpg'] = 'image/jpeg'; |
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$extList['jpeg'] = 'image/jpeg'; |
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$extList['png'] = 'image/png'; |
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// You don't need to edit anything after this point. |
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// --------------------- END CONFIGURATION ----------------------- |
if ( !empty( $files ) ) { |
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$img = null; |
$which = rand(0,sizeof($files)-1) ; |
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if (substr($folder,-1) != '/') { |
if ( $file = file_get_contents( $files[$which] ) ) { |
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$folder = $folder.'/'; |
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} |
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if (isset($_GET['img'])) { |
$parts = explode('.',$files[$which]) ; |
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$imageInfo = pathinfo($_GET['img']); |
$ext = strtolower($parts[sizeof($parts)-1]) ; |
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if ( |
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isset( $extList[ strtolower( $imageInfo['extension'] ) ] ) && |
header( "Content-type: " . $file_types[$ext] ) ; |
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file_exists( $folder.$imageInfo['basename'] ) |
header( "Expires: Wed, 29 Jan 1975 04:15:00 GMT" ); |
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) { |
header( "Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT" ); |
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$img = $folder.$imageInfo['basename']; |
header( "Cache-Control: no-cache, must-revalidate" ); |
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} |
header( "Pragma: no-cache" ); |
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} else { |
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$fileList = array(); |
print $file ; |
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$handle = opendir($folder); |
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while ( false !== ( $file = readdir($handle) ) ) { |
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$file_info = pathinfo($file); |
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if ( |
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isset( $extList[ strtolower( $file_info['extension'] ) ] ) |
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) { |
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$fileList[] = $file; |
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} |
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} |
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closedir($handle); |
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if (count($fileList) > 0) { |
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$imageNumber = time() % count($fileList); |
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$img = $folder.$fileList[$imageNumber]; |
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} |
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} |
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if ($img!=null) { |
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$imageInfo = pathinfo($img); |
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$contentType = 'Content-type: '.$extList[ $imageInfo['extension'] ]; |
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header ($contentType); |
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/* fixes cahce issue, thanks to dchapiesky */ |
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header( "Expires: Mon, 20 Dec 1998 01:00:00 GMT" ); |
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header( "Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT" ); |
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header( "Cache-Control: no-cache, must-revalidate" ); |
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header( "Pragma: no-cache" ); |
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readfile($img); |
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} else { |
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if ( function_exists('imagecreate') ) { |
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header ("Content-type: image/png"); |
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$im = @imagecreate (100, 100) |
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or die ("Cannot initialize new GD image stream"); |
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$background_color = imagecolorallocate ($im, 255, 255, 255); |
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$text_color = imagecolorallocate ($im, 0,0,0); |
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imagestring ($im, 2, 5, 5, "IMAGE ERROR", $text_color); |
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imagepng ($im); |
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imagedestroy($im); |
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} |
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} |
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?> |
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} |
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