This is a button interface for the admin backend’s overview page.

Finds newly uploaded images that have not been cached and creates the cached version. It also refreshes the numbers above. If you have a large number of images in your gallery you might consider using the pre-cache image link for each album to avoid swamping your browser

a. Reduce load on the DB server

Developed by invarbrass

This is based on the caching technique described on http://www.zenphoto.org/2008/01/hacks/ We’ll use eAccelerator shm cache instead of storing the query results on disk.
1. Edit the functions-db.php under zp-core directory.
2. Search function query_single_row, change it to:
function query_single_row($sql, $noerrmsg=false) {
if ($cache = get_cache($sql))
return $cache;
$result = query($sql, $noerrmsg);
if ($result) {
$data = mysql_fetch_assoc($result);
store_cache($sql, $data);
return $data;
}
else {
return false;
}
}
3. Search function query_full_array, change it to:
function query_full_array($sql, $noerrmsg = false) {
if ($cache = get_cache($sql))
return $cache;
$result = query($sql, $noerrmsg);
if ($result) {
$allrows = array();
while ($row = mysql_fetch_assoc($result))
$allrows[] = $row;
store_cache($sql, $allrows);
return $allrows;
}
else {
return false;
}
}
4. Last thing, add two functions in functions-db.php. You could change “cachedirectory” to your cache directory, and change $cache_time_out to the expire time you want.
function store_cache($query, $result_cache) {
$cache_time_out = 600;
if (preg_match("/^(insert|delete|update|replace)\s+/i",$query))
return;
if (stristr($query, "ORDER BY RAND"))
return;
$key = 'sql_' . md5($query);
$val = serialize($result_cache);
eaccelerator_put($key, $val, $cache_time_out);
}

function get_cache($query) {
if (preg_match("/^(insert|delete|update|replace)\s+/i",$query))
return;
if (stristr($query, "ORDER BY RAND"))
return;
$key = 'sql_' . md5($query);
$val = eaccelerator_get($key);
if ( $val != NULL )
return unserialize($val);
}

b. Bypassing directory traversal

Developed by invarbrass
ZP scans the albums directory every time the script is executed. Since disk operations are expensive, we can try to limit disk-based I/O to make it load faster. We’ll be using eAccelerator to cache our stuff, but you can easily adopt this code for APC, XCache, memcached or even a disk-file.
1. Open class-album.php in zp-core directory.
2. Put the following code at the beginning of the script:
function store_filenames_cache($dir, $has_dir, $pic_cache, $vid_cache) {
$cache_time_out = 600;
if ($has_dir) {
$pic_key = 'dp_' . md5($dir);
$vid_key = 'dv_' . md5($dir);
}
else {
$pic_key = 'fp_' . md5($dir);
$vid_key = 'fv_' . md5($dir);
}
$pic_val = serialize($pic_cache);
$vid_val = serialize($vid_cache);
eaccelerator_put($pic_key, $pic_val, $cache_time_out);
eaccelerator_put($vid_key, $vid_val, $cache_time_out);
}
function get_filenames_cache($dir, $has_dir, &$pic_cache, &$vid_cache) {
if ($has_dir) {
$pic_key = 'dp_' . md5($dir);
$vid_key = 'dv_' . md5($dir);
}
else {
$pic_key = 'fp_' . md5($dir);
$vid_key = 'fv_' . md5($dir);
}
$pic_cache = eaccelerator_get($pic_key);
$vid_cache = eaccelerator_get($vid_key);
if ( $pic_cache != NULL ) {
$pic_cache = unserialize($pic_cache);
}
else {
return FALSE;
}
if ( $vid_cache != NULL ) {
$vid_cache = unserialize($vid_cache);
}
else {
return FALSE;
}
return TRUE;
}
3. Locate the loadFileNames() function, and replace it with this:
function loadFileNames($dirs=false) {
if ($this->isDynamic()) { // there are no 'real' files
return array();
}
$albumdir = getAlbumFolder() . $this->name . "/";
if (!is_dir($albumdir) || !is_readable($albumdir)) {
$msg = gettext("Error: The 'albums' directory")." (" . $this->albumdir . ") ";
if (!is_dir($this->albumdir)) {
$msg .= gettext("cannot be found.");
} else {
$msg .= gettext("is not readable.");
}
die($msg);
}
//masroore - cache these results
if (get_filenames_cache($albumdir, $dirs, $files, $videos) === FALSE) {
$dir = opendir($albumdir);
$files = array();
$videos = array();
while (false !== ($file = readdir($dir))) {
if ($dirs && (is_dir($albumdir.$file) && (substr($file, 0, 1) != '.') || hasDyanmicAlbumSuffix($file))) {
$files[] = $file;
} else if (!$dirs && is_file($albumdir.$file)) {
if (is_valid_video($file)) {
$files[] = $file;
$videos[] = $file;
} else if (is_valid_image($file)) {
$files[] = $file;
}
}
}
closedir($dir);
store_filenames_cache($albumdir, $dirs, $files, $videos);
}
if (count($videos) > 0) {
$video_thumbs = array();
foreach($videos as $video) {
$video_root = substr($video, 0, strrpos($video,"."));
foreach($files as $image) {
$image_root = substr($image, 0, strrpos($image,"."));
if ($image_root == $video_root && $image != $video) {
$video_thumbs[] = $image;
}
}
}
$files = array_diff($files, $video_thumbs);
}
return $files;
}

View the following links for details.

HTTP cache control

HTTP Static cache control