hpdl
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<?php
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/*
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$Id: cache.php,v 1.7 2004/04/08 02:29:32 hpdl Exp $
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osCommerce, Open Source E-Commerce Solutions
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http://www.oscommerce.com
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Copyright (c) 2004 osCommerce
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Released under the GNU General Public License
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Class usage examples:
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- Caching HTML:
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if ($osC_Cache->read('key', 60) === false) {
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$osC_Cache->startBuffer();
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------ PHP/HTML LOGIC HERE ------
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$osC_Cache->stopBuffer();
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}
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echo $osC_Cache->getCache();
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- Caching data (in memory):
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if ($osC_Cache->read('key', 60) {
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$variable = $osC_Cache->getCache();
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} else {
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$variable = array('some', 'data');
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$osC_Cache->writeBuffer($variable);
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}
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*/
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class osC_Cache {
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var $cached_data,
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$cache_key;
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function write($key, &$data) {
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$filename = DIR_FS_WORK . $key . '.cache';
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if ($fp = @fopen($filename, 'w')) {
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flock($fp, 2); // LOCK_EX
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fputs($fp, serialize($data));
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flock($fp, 3); // LOCK_UN
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fclose($fp);
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return true;
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}
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return false;
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}
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function read($key, $expire = 0) {
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$this->cache_key = $key;
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$filename = DIR_FS_WORK . $key . '.cache';
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if (file_exists($filename)) {
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$difference = floor((time() - filemtime($filename)) / 60);
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if ( ($expire == '0') || ($difference < $expire) ) {
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if ($fp = @fopen($filename, 'r')) {
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$this->cached_data = unserialize(fread($fp, filesize($filename)));
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fclose($fp);
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return true;
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}
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}
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}
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return false;
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}
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function &getCache() {
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return $this->cached_data;
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}
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function startBuffer() {
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ob_start();
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}
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function stopBuffer() {
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$this->cached_data = ob_get_contents();
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ob_end_clean();
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$this->write($this->cache_key, $this->cached_data);
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}
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function writeBuffer(&$data) {
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$this->cached_data = $data;
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$this->write($this->cache_key, $this->cached_data);
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}
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function clear($key) {
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$key_length = strlen($key);
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$d = dir(DIR_FS_WORK);
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while ($entry = $d->read()) {
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if ((strlen($entry) >= $key_length) && (substr($entry, 0, $key_length) == $key)) {
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@unlink(DIR_FS_WORK . $entry);
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}
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}
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$d->close();
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}
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}
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?>
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