begin of thinksaas 3.68

Signed-off-by: kevin <kevin@lmve.net>

thinksaas/tsFileCache.php

@@ -0,0 +1,85 @@
+<?php
+defined ( 'IN_TS' ) or die ( 'Access Denied.' );
+class tsFileCache {
+	private $cache_path; // path for the cache
+	private $cache_expire; // seconds that the cache expires
+	                       
+	// cache constructor, optional expiring time and cache path
+	public function __construct($exp_time = 3600, $path = "data/") {
+		$this->cache_expire = $exp_time;
+		$this->cache_path = $path;
+	}
+	
+	// returns the filename for the cache
+	private function fileName($key) {
+		return $this->cache_path . md5 ( $key );
+	}
+	
+	// creates new cache files with the given data, $key== name of the cache, data the info/values to store
+	public function put($key, $data) {
+		$values = serialize ( $data );
+		$filename = $this->fileName ( $key );
+		$file = fopen ( $filename, 'w' );
+		if ($file) { // able to create the file
+			fwrite ( $file, $values );
+			fclose ( $file );
+		} else
+			return false;
+	}
+	
+	// returns cache for the given key
+	public function get($key) {
+		$filename = $this->fileName ( $key );
+		if (! file_exists ( $filename ) || ! is_readable ( $filename )) { // can't read the cache
+			return false;
+		}
+		if (time () < (filemtime ( $filename ) + $this->cache_expire)) { // cache for the key not expired
+			$file = fopen ( $filename, "r" ); // read data file
+			if ($file) { // able to open the file
+				$data = fread ( $file, filesize ( $filename ) );
+				fclose ( $file );
+				return unserialize ( $data ); // return the values
+			} else
+				return false;
+		} else
+			return false; // was expired you need to create new
+	}
+}
+
+
+/*
+
+使用说明：
+
+1、实例化
+
+$cache = new tsFileCache();
+2、设置缓存时间和缓存目录
+
+$cache = new tsFileCache(60, '/any_other_path/');
+第一个参数是缓存秒数，第二个参数是缓存路径，根据需要配置。
+默认情况下，缓存时间是 3600 秒，缓存目录是 cache/
+
+3、读取缓存
+
+$value = $cache->get('data_key');
+4、写入缓存
+
+$value = $cache->put('data_key', 'data_value');
+完整实例：
+
+$cache = new tsCache();
+
+//从缓存从读取键值 $key 的数据
+$values = $cache->get($key);
+
+//如果没有缓存数据
+if ($values == false) {
+	//insert code here...
+	//写入键值 $key 的数据
+	$cache->put($key, $values);
+} else {
+	//insert code here...
+}
+
+*/