81 lines
1.9 KiB
PHP
81 lines
1.9 KiB
PHP
<?php
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class Cache
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{
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protected $_dir;
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protected $_ext;
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protected $_page;
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protected $_file;
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public function __construct($dir, $ext)
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{
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$this->_dir = $dir;
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$this->_ext = $ext;
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$this->_page = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
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$this->_file = $this->_dir . md5($this->_page) . '.' . $this->_ext;
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}
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/**
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* Begins caching the output.
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*
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* @return A boolean value indicating whether a valid cached version of the
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* page was found and echoed (false), or not (true).
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*/
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public function begin()
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{
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$showCache = (file_exists($this->_file) && $this->isValid());
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clearstatcache();
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if ($showCache) {
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readfile($this->_file);
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return false;
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} else {
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ob_start();
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return true;
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}
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}
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/**
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* Ends caching the output and saves it to a cache file.
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*
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*/
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public function end()
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{
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// Generate a new cache file
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$fp = @fopen($this->_file, 'w');
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// Save the contents of output buffer to the file
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@fwrite($fp, ob_get_contents());
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@fclose($fp);
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ob_end_flush();
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}
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/**
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* Deletes all files in the cache directory.
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*/
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public function clear()
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{
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if ($handle = opendir($this->_dir)) {
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while ($file = readdir($handle)) {
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if ($file !== '.' && $file !== '..') {
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@unlink($this->_dir . '/' . $file);
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}
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}
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closedir($handle);
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}
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}
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/**
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* This method is used to check whether the cache file is valid to use.
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*
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* Currently it assumes that the cache file is always valid.
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*
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* @return True, if cache file is valid; false otherwise.
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*/
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protected function isValid()
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{
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return true;
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}
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} |