85 lines
2.2 KiB
PHP
85 lines
2.2 KiB
PHP
<?php
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defined ( 'IN_TS' ) or die ( 'Access Denied.' );
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class tsFileCache {
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private $cache_path; // path for the cache
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private $cache_expire; // seconds that the cache expires
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// cache constructor, optional expiring time and cache path
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public function __construct($exp_time = 3600, $path = "data/") {
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$this->cache_expire = $exp_time;
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$this->cache_path = $path;
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}
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// returns the filename for the cache
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private function fileName($key) {
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return $this->cache_path . md5 ( $key );
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}
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// creates new cache files with the given data, $key== name of the cache, data the info/values to store
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public function put($key, $data) {
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$values = serialize ( $data );
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$filename = $this->fileName ( $key );
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$file = fopen ( $filename, 'w' );
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if ($file) { // able to create the file
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fwrite ( $file, $values );
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fclose ( $file );
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} else
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return false;
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}
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// returns cache for the given key
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public function get($key) {
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$filename = $this->fileName ( $key );
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if (! file_exists ( $filename ) || ! is_readable ( $filename )) { // can't read the cache
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return false;
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}
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if (time () < (filemtime ( $filename ) + $this->cache_expire)) { // cache for the key not expired
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$file = fopen ( $filename, "r" ); // read data file
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if ($file) { // able to open the file
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$data = fread ( $file, filesize ( $filename ) );
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fclose ( $file );
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return unserialize ( $data ); // return the values
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} else
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return false;
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} else
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return false; // was expired you need to create new
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}
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}
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/*
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使用说明：
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1、实例化
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$cache = new tsFileCache();
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2、设置缓存时间和缓存目录
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$cache = new tsFileCache(60, '/any_other_path/');
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第一个参数是缓存秒数，第二个参数是缓存路径，根据需要配置。
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默认情况下，缓存时间是 3600 秒，缓存目录是 cache/
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3、读取缓存
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$value = $cache->get('data_key');
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4、写入缓存
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$value = $cache->put('data_key', 'data_value');
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完整实例：
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$cache = new tsCache();
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//从缓存从读取键值 $key 的数据
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$values = $cache->get($key);
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//如果没有缓存数据
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if ($values == false) {
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//insert code here...
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//写入键值 $key 的数据
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$cache->put($key, $values);
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} else {
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//insert code here...
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}
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*/ |