以文件形式缓存php变量的方法_PHP教程

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/*

$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']

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){

$write_data = "".serialize($data);

//return $data;

}else {

$write_data = "

$write_data .= var_export($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 */

$cache_Content = unserialize($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;

}

}

?>