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【PHP】用于以文件形式缓存php变量
作者:沉淀岁月 / 发布于2013/9/13/ 653

	<?php
	/*
	$cache_set = array(
	//缓存路径 , 最后要加"/"
	'cacheRoot'=>'./cache/',
	//缓存时间
	'cacheTime'=>20,
	//cache type
	'cacheType'=>1,
	//扩展名
	'cacheExe'=>'.php'
	);
	$cache = new Cache($cache_set);
	$a=array('1','2');
	$a="aaa";
	$b='';
	if($cache->cache_is("d")){
	 $c=$cache->cache_read("d");
	 echo "c";
	 print_r($c);
	}else {
	$b=$cache->cache_data('d',$a);
	}
	print_r($b);
	//$cache->clear("a");
	//echo $cache->cache_read("./cache/d.php");
	//echo $d;
	*/
	
	
	/**
	* 数据缓存类 v1.0
	* @author shooke
	* 2009-11-13 16:02:26
	* 用于缓存数据,如变量,但不能缓存页面
	*/
	class Cache{
	 //配置
	 public $config = array(
	 //缓存路径
	 'cacheRoot'=>'./cache/',
	 //缓存时间
	 'cacheTime'=>1,
	 //cache 类型 1串化数据 2变量
	 'cacheType'=>2,
	 //扩展名
	 'cacheExe'=>'.php'
	 //转换中间变量
	 );
	
	 public $return_name=array();
	
	 function __construct($cache_set = array())
	 {
	 if(!empty($cache_set)) $this->config=array_merge($this->config,$cache_set);
	 $this->config['ClassName'] = __CLASS__;
	 }
	
	 public function clear($filename=''){
	 if (file_exists($this->cache_file($filename))) {
	 @unlink($this->cache_file($filename));
	 }elseif (empty($filename)){
	 $this->clear_dir($this->config['cacheRoot']);
	 }else{
	 $this->clear_dir($this->config['cacheRoot'].$filename);
	 echo $this->config['cacheRoot'].$filename;
	 }
	 }
	 //循环删除路径
	 private function clear_dir($dir,$to = false)
	 {
	 if ($list = glob($dir.'/*'))
	 {
	 foreach ($list as $file)
	 {
	 is_dir($file) ? $this->clear_dir($file) : unlink($file);
	 }
	 }
	
	 if ($to === false) rmdir($dir);
	 }
	
	 //写入缓存
	 private function cache_write($filename, $writetext, $openmod='w'){
	 if (!file_exists($filename)) {
	 @$this->makeDir( dirname($filename ));
	 }
	 if(@$fp = fopen($filename, $openmod)) {
	 flock($fp, 2);
	 fwrite($fp, $writetext);
	 fclose($fp);
	 return true;
	 } else {
	 echo "File: $filename write error.";
	 return false;
	 }
	 }
	
	 //缓存有效期 有效返回 true
	 public function cache_is($fileName){
	 $fileName=$this->cache_file($fileName);
	 if( file_exists( $fileName ) ) {
	 //如果缓存时间为负数则永不过期
	 if ($this->config['cacheTime'] < 0) {
	 return true;
	 }
	 //如果缓存时间为0则一直过期
	 if ($this->config['cacheTime'] == 0) {
	 return false;
	 }
	 //获取缓存文件的建立时间
	 $ctime = intval(filemtime( $fileName ));
	 //比较是否大于缓存时间,是则过期 否则不过期
	 if (time() - $ctime > $this->config['cacheTime']) {
	 return false;
	 }else {
	 return true;
	 }
	 //文件不存在视为过期失效
	 }else {
	 return false;
	 }
	 }
	
	 public function cache_data($name,$data){
	 $varname=$name;
	 $name = $this->cache_file($name);
	 //config['cacheTime']==0也就是不启用缓存是直接返回数据
	 if ($this->config['cacheTime'] <> 0) {
	 if($this->config['cacheType']==1){
	 $write_data = "<?php exit;?>".serialize($data);
	 //return $data;
	 }else {
	 $write_data = "<?php\\r\\n\\$var= ";
	 $write_data .= var_export($data,true);
	 $write_data .=";\\r\\n?>";
	 }
	 $this->cache_write($name,$write_data);
	 }
	 return $data;
	
	 }
	 //缓存文件名
	 private function cache_file($filename){
	 return $this->config['cacheRoot'].$filename.$this->config['cacheExe'];
	 }
	
	 //读取文件
	 public function cache_read($file){
	 $file=$this->cache_file($file);
	 if (!file_exists($file)) {
	 return '';
	 }
	 if($this->config['cacheType']==1){
	 if (function_exists('file_get_contents')){
	 $cache_Content= file_get_contents($file);
	 }else{
	 $fopen = fopen($file,'r');
	 $cache_Content = '';
	 do {
	 $data = fread($fopen,filesize($file));
	 if (strlen($data)===0) break;
	 $cache_Content .= $data;
	 }while(1);
	 fclose($fopen);
	 }
	 $cache_Content = substr($cache_Content,13);/* 去除<?php exit;?> */
	 $cache_Content = unserialize($cache_Content);
	 return $cache_Content;
	 }else{
	 include_once($file);
	 return $var;
	 }
	
	 }
	
	 //循环创建目录
	 private function makeDir( $dir, $mode = 0777 ) {
	 if( ! $dir ) return 0;
	 $dir = str_replace( "\\\\", "/", $dir );
	 $mdir = "";
	 foreach( explode( "/", $dir ) as $val ) {
	 $mdir .= $val."/";
	 if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;
	
	 if( ! file_exists( $mdir ) ) {
	 if(!@mkdir( $mdir, $mode )){
	 return false;
	 }
	 }
	 }
	 return true;
	 }
	
	}
	?>
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