[Resolved] Rotating background

[Hans]

I want to change the background on specific pages/articles of my site. Therfore I use this php:

<?php
/*
By Matt Mullenweg > http://photomatt.net
Inspired by Dan Benjamin > http://hiveware.com/imagerotator.php
Latest version always at:
http://photomatt.net/scripts/randomimage
*/// Make this the relative path to the images, like "../img" or "random/images/".
// If the images are in the same directory, leave it blank.
$folder = '';

// Space seperated list of extensions, you probably won't have to change this.
$exts = 'jpg jpeg png gif';

$files = array(); $i = -1; // Initialize some variables
if ('' == $folder) $folder = './';

$handle = opendir($folder);
$exts = explode(' ', $exts);
while (false !== ($file = readdir($handle))) {
foreach($exts as $ext) { // for each extension check the extension
if (preg_match('/\.'.$ext.'$/i', $file, $test)) { // faster than ereg, case insensitive
$files[] = $file; // it's good
++$i;
}
}
}
closedir($handle); // We're not using it anymore
mt_srand((double)microtime()*1000000); // seed for PHP < 4.2
$rand = mt_rand(0, $i); // $i was incremented as we went along

header('Location: '.$folder.$files[$rand]+'?'+(new Date()).toString();); // Voila!
?>

On the specific pages/articles I use this hook (after header content):

<img src='http://swimages.spd-simmerath.de/bgimage/rotate.php' id='ktgbild' alt=''>

With Edge it works fine. With Firefox only when I refresh the page. Opera and Chrome always show the same background.

I change the .htaccess as follows:

# BEGIN WordPress
<filesMatch "\.(html|htm|php|jpg)$">
 FileETag None
 <ifModule mod_headers.c>
 Header unset ETag
 Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
 Header set Pragma "no-cache"
 Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
</ifModule>
</filesMatch>
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Nothing changes in the behaviour. The network protocol doesn’t show any access to the background file.

What is wrong with my site? The URL shown below should have a changing background. With legacy hoohs it works on another site.

[Hans]

–

[Tom]

That code looks pretty complicated.

I would just do something like this in the hook:

<?php
$images = array(
    'https://yoursite.com/img1.jpg', 
    'https://yoursite.com/img2.jpg', 
    'https://yoursite.com/img3.jpg'
);

$random_image = array_rand( $images );
?>

<img src="<?php echo $images[ $random_image ]; ?>" />

[Hans]

Your code works. The only disadvantes is that I have to modify it when I delete or add images.

Thanks!

[Tom]

That’s true, but it does simplify the code considerably. I’m not very good with the folder lookup kind of PHP, unfortunately.

[Author]

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