[Resolved] Rotating background

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  • #967732
    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.

    #967801
    Hans

    #968027
    Tom
    Lead Developer
    Lead Developer

    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 ]; ?>" />
    #968069
    Hans

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

    Thanks!

    #968214
    Tom
    Lead Developer
    Lead Developer

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

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