Randomise my Forum's Logo?

[SergeantAsh]

This is possibly a very simple one but I want to randomise my forums logo! I've hardcoded the images path into the code, so the TD cell now look like this...

<td class="AshHeaderBanner" height="85" align="left"><a href="vauxhall_calibra_clubcalibra.html"><img src="http://www.clubcalibra.com/graphics/logos/clubcalibra1.gif" alt="', $context['forum_name'], '" border="0" /></a></td>

What would I add to this code to perhaps randomise between 3 images, clubcalibra1.gif, clubcalibra2.gif, clubcalibra3.gif?

I'm an ASP person, not PHP so I haven't really a clue!

Many thanks!

Cheers, Ash

[SergeantAsh]

For anyone else looking to do this, I've found a useful little script...

Paste the following into a file called 'rotate.php' or similar...

<?php

   $folder = '.';

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


// --------------------- 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);
   }
}

?>

Then, in your image tag, do this...
<img src="rotate.php">

Should work fine! Put the rotate.php into the SAME directory as your random images.

[kegobeer]

If you just want to pick a random image, just do this:

Code Select Expand


<td class="AshHeaderBanner" height="85" align="left"><a href="vauxhall_calibra_clubcalibra.html"><img src="http://www.clubcalibra.com/graphics/logos/clubcalibra', rand(1,3), '.gif" alt="', $context['forum_name'], '" border="0" /></a></td>


Make three images named clubcalibra1.gif, clubcalibra2.gif, and clubcalibra3.gif.

[SergeantAsh]

Thanks for that, much simpler bit of code but I'll stick with my script now as I can simply upload files to the directory and they're randomised without having to change the code.

[AllBucDUp]

Great job Ashley.

[carlatf]

Hi,
Thanks for the code, I really like the ability to not have to enter the image URL.

In case anyone is looking for a changeable set but in order here's the code.

/portada is the directory of the images


  <script type="text/javascript" language="javascript">
var headerimageURLs = new Array(

\'/portada/select10.jpg\' ,
\'/portada/select11.jpg\' ,
\'/portada/select12.jpg\' ,
\'/portada/select13.jpg\' ,
\'/portada/select14.jpg\' ,
\'/portada/select15.jpg\' ,
\'/portada/select16.jpg\' ,
\'/portada/select17.jpg\' ,

);

var whichimg;
if (window.name.indexOf(\'headerimage_\') == -1) whichimg = 0;
else {
whichimg = Number(window.name.split(\'_\')[1]);
whichimg = (whichimg == headerimageURLs.length - 1) ? 0 : ++whichimg;
}
window.name = String(\'headerimage_\' + whichimg);
document.write(\' <a  href="', $context['forum_url'], '" title="discussion forum"><img border="0"  alt=" ', $context['forum_name'], '" border="0" align="center" src="\' + headerimageURLs[whichimg] + \'" /></a>\');

</script>

[SleePy]

I use 2 different types of ranodmizing with a option in forum profile to change it.
Heres the first one I do:

Code Select Expand


<?php 
////////////////////////////////////////////////////////////////////// 
/*                  Matt Sims' PHP Sig Rotator V1.3                 */ 
/* This script takes an inventory of all image files in a directory */ 
/* and displays one at random. All you need to do is save this code */ 
/* in a directory that contains your images (name it what you will, */ 
/* but make sure it has a ".php" extension). Then just link to this */ 
/* script to get your random image.                                 */ 
/* I would recommend naming this file "index.php," and then you can */ 
/* just link to the directory itself (like I do in my example).     */ 
/* [email protected]      www.evilmerc.com             */ 
////////////////////////////////////////////////////////////////////// 

if ($dir = opendir(".")) 
    $list = buildimagearray($dir); displayrandomimage($list); 

// This function reads all the files in the current directory and adds all image files to the array $list[] 
function buildimagearray($dir) 
{ 
     while (false !== ($file = readdir($dir))) 
     { 
          if (!is_dir($file) && getimagesize($file)) 
               $list[] = $file; 
     } 
     return $list; 
} 

// This function selects a random image, determines the mime type, opens the file for reading, and then outputs the image 
function displayrandomimage($list) 
{ 
     srand ((double) microtime() * 10000000); $sig = array_rand ($list); $size = getimagesize ($list[$sig]); $fp = fopen($list[$sig], "rb"); 
     if ($size && $fp) 
          header("Content-type: {$size['mime']}"); fpassthru($fp); exit; 
} 
?>
and for that you put for the image url:
http://yoursite.com/path/index.php

the next one requires you to edit your index.template.php and put it inplace of were your logo would be. remember to get out of any echos. This is like kegobeer's script. But I made it so it auto updated the images for me.
It just does a while command and finds out if a file exists or not and counts.
I added some comments to explain the code a bit.

Code Select Expand


$h = 1; // have to set this to 1 other else it wont work correctly.
$st = 0; // Set this so an error isn't reported so that the while statement doesn't report the error x ammount of times.
while($st == 0){
if(!file_exists('/relative/path/to/banners/banner'.$h.'.jpg'))
$st = 1; // If there is not file we tell the while loop to stop.
else
$h++;  // The file exists lets increase our number by 1 and continue on.
}
$h = $h -1; // It over counts because h is set to 1. but that is ok
$randomnumber = rand(1, $h);  // Randomly grab a number and prepare it for echo
echo '<img src="http://www.yoursite.com/banners/banner'.$randomnumber.'.jpg" height="200" width="800" />';