<?php
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class LtStoreFile implements LtStore
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{
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public $storeDir;
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public $prefix = 'LtStore';
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public $useSerialize = false;
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static public $defaultStoreDir = "/tmp/LtStoreFile/";
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public function init()
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{
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/**
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* 目录不存在和是否可写在调用add是测试
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* @todo detect dir is exists and writable
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*/
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if (null == $this->storeDir)
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{
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$this->storeDir = self::$defaultStoreDir;
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}
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$this->storeDir = str_replace('\\', '/', $this->storeDir);
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$this->storeDir = rtrim($this->storeDir, '\\/') . '/';
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}
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/**
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* 当key存在时:
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* 如果没有过期, 不更新值, 返回 false
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* 如果已经过期, 更新值, 返回 true
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*
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* @return bool
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*/
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public function add($key, $value)
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{
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$file = $this->getFilePath($key);
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$cachePath = pathinfo($file, PATHINFO_DIRNAME);
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if (!is_dir($cachePath))
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{
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if (!@mkdir($cachePath, 0777, true))
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{
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trigger_error("Can not create $cachePath");
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}
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}
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if (is_file($file))
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{
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return false;
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}
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if ($this->useSerialize)
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{
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$value = serialize($value);
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}
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$length = file_put_contents($file, '<?php exit;?>' . $value);
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return $length > 0 ? true : false;
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}
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/**
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* 删除不存在的key返回false
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*
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* @return bool
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*/
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public function del($key)
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{
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$file = $this->getFilePath($key);
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if (!is_file($file))
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{
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return false;
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}
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else
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{
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return @unlink($file);
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}
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}
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/**
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* 取不存在的key返回false
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* 已经过期返回false
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*
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* @return 成功返回数据,失败返回false
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*/
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public function get($key)
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{
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$file = $this->getFilePath($key);
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if (!is_file($file))
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{
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return false;
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}
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$str = file_get_contents($file);
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$value = substr($str, 13);
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if ($this->useSerialize)
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{
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$value = unserialize($value);
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}
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return $value;
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}
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/**
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* key不存在 返回false
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* 不管有没有过期,都更新数据
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*
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* @return bool
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*/
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public function update($key, $value)
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{
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$file = $this->getFilePath($key);
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if (!is_file($file))
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{
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return false;
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}
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else
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{
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if ($this->useSerialize)
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{
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$value = serialize($value);
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}
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$length = file_put_contents($file, '<?php exit;?>' . $value);
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return $length > 0 ? true : false;
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}
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}
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public function getFilePath($key)
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{
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$token = md5($key);
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return $this->storeDir .
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$this->prefix . '/' .
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substr($token, 0, 2) .'/' .
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substr($token, 2, 2) . '/' .
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$token . '.php';
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}
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}
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