MyShaarli/application/Cache.php

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PHP
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<?php
/**
* Cache utilities
*/
/**
* Purges all cached pages
*
* @param string $pageCacheDir page cache directory
*
* @return mixed an error string if the directory is missing
*/
function purgeCachedPages($pageCacheDir)
{
if (! is_dir($pageCacheDir)) {
$error = 'Cannot purge '.$pageCacheDir.': no directory';
error_log($error);
return $error;
}
array_map('unlink', glob($pageCacheDir.'/*.cache'));
}
/**
* Invalidates caches when the database is changed or the user logs out.
*
* @param string $pageCacheDir page cache directory
*/
function invalidateCaches($pageCacheDir)
{
// Purge cache attached to session.
if (isset($_SESSION['tags'])) {
unset($_SESSION['tags']);
}
// Purge page cache shared by sessions.
purgeCachedPages($pageCacheDir);
}