afc2d2e4e1
If the directory "banners_priority" exists and contains files, a file from it is served 33% of the time, an a file from "banners" 66% of the time. This may seem like an odd definition of "priority", but assuming far fewer priority banners than normal banners, this gives them extra weight in the selection. Before, any 1 banner in 100 had a 1% chance of being served; now if that banner is a priority banner it has a 33% chance.
48 lines
1.3 KiB
PHP
Executable File
48 lines
1.3 KiB
PHP
Executable File
<?php
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// This script assumes there is at least one normal (non-priority)
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// banner!
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// Get the files in a directory, returns null if the directory does
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// not exist.
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function getFilesInDirectory($dir) {
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if (! is_dir($dir)) {
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return null;
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}
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return array_diff(scandir($dir), array('.', '..'));
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}
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// Serve a random banner and exit.
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function serveRandomBanner($dir, $files) {
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$name = $files[array_rand($files)];
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// snags the extension
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$ext = pathinfo($name, PATHINFO_EXTENSION);
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// send the right headers
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header('Cache-Control: no-cache, no-store, must-revalidate'); // HTTP 1.1
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header('Pragma: no-cache'); // HTTP 1.0
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header('Expires: 0'); // Proxies
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header("Content-type: image/" . ext);
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header("Content-Disposition: inline; filename=" . $name);
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// readfile displays the image, passthru seems to spits stream.
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readfile($dir.$name);
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exit;
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}
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// Get all the banners
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$bannerDir = "banners/";
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$priorityDir = "banners_priority/";
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$banners = getFilesInDirectory($bannerDir);
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$priority = getFilesInDirectory($priorityDir);
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// If there are priority banners, serve 1/3rd of the time.
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if($priority !== null && count($priority) !== 0 && rand(0,2) === 0) {
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serveRandomBanner($priorityDir, $priority);
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}
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serveRandomBanner($bannerDir, $banners);
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?>
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