本文实例讲述了以文件形式缓存php变量的方法。分享给大家供大家参考。具体实现方法如下:
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<?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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希望本文所述对大家的php程序设计有所帮助。