/**
* Get the lastest time the folder or one of its descendants has been modified.
* @param string $dir
* An absolute path to a folder.
* @param int $depth
* 0 for current folder only, 1 for current and children, n (>1) for descandants until the given limit, -1 for all descendants.
*/
function get_folder_last_modified($dir, $depth = 0)
{
$mtime = filemtime($dir);
if ($depth != 0) {
// scan directory for last modified descandant folder
if ($dh = @opendir($dir)) {
while (($entry = readdir($dh)) !== false) {
if ($entry != '.' && $entry != '..' && is_dir($dir . DIRECTORY_SEPARATOR . $entry)) {
$mtime = max($mtime, get_folder_last_modified($dir . DIRECTORY_SEPARATOR . $entry, $depth - 1));
}
}
closedir($dh);
}
}
return $mtime;
}
/**
* Fetches cached content for the specified directory and parameters.
* @param string $imagebase
* Base for computing image folder hash, typically an absolute file system path to the image or the directory where the images reside.
* @param $params
* Parameters that affect how the gallery is to be displayed.
*/
public function getCachedContent($imagebase, SIGPlusGalleryParameters $params)
{
if ($this->config->contentcache) {
// use cache folder
$cachekey = $this->getCacheKey($imagebase, $params);
$cachefile = $this->getCachedContentPath($cachekey, $params->linkage == 'inline' ? '.html' : '.js');
if (is_file($cachefile)) {
// content available in cache only if cache file exists
if (is_remote_path($imagebase)) {
return $cachekey;
} elseif (is_dir($imagebase)) {
// check if directory or labels file has changed
$labelsfile = $this->getLabelsFilePath($imagebase, $params->labels);
if (filemtime($cachefile) >= get_folder_last_modified($imagebase, $params->depth) && ($labelsfile === false || filemtime($cachefile) >= filemtime($labelsfile))) {
return $cachekey;
}
} elseif (is_file($imagebase)) {
// check if file has changed
if (filemtime($cachefile) >= filemtime($imagebase)) {
return $cachekey;
}
}
}
}
return false;
}
