Rotating Sig Images?

<?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);
	}
}

?>

I can't remember where I got this, but I've had it for a while sitting in an old snippets folder. It works with [img] tags. I used it to host Paco's mexican joke sig from a while back.

Forgive me if it's patronizing but I'll be as beginner friendly as possible.

Copy, paste, throw into your favorite text editor, save with a .php extension.

Throw it into the folder full of the images you want to rotate on your host, and then go
[ img]http://www.crashlandon.com/sigs/rotatin/nameofscript.php[/img].

You can add more supported file types to the file type array as long as your mime-type is correct, and you can put this rotator script elsewhere if you change the $folder variable to point to the full path of the folder full of images you want to use.

Edit: See?



Jam it back in, in the dark.