分享PHP的一个缓存类 cache

实例：
include( "cache.php" );
$cache = new cache(30);
$cache->cacheCheck();
echo date("Y-m-d H:i:s");

$cache->caching();

代码

<? php
PHP缓存类 cache http://bbs.hfphp.org
class cache {
// 缓存目录
var $cacheRoot = " ./cache/ " ;
// 缓存更新时间秒数，0为不缓存
var $cacheLimitTime = 0 ;
// 缓存<span href="tag.php?name=%E6%96%87%E4%BB%B6" target="_blank" rel="external nofollow" οnclick="tagshow(event)" class="t_tag">文件</span>名
var $cacheFileName = "" ;
// 缓存扩展名
var $cacheFileExt = " php " ;

function cache( $cacheLimitTime ) {
    if ( intval ( $cacheLimitTime ) )
    $this -> cacheLimitTime = $cacheLimitTime ;
    $this -> cacheFileName = $this -> getCacheFileName();
    ob_start ();
}

function cacheCheck(){
    if ( file_exists ( $this -> cacheFileName ) ) {
    $cTime = $this -> getFileCreateTime( $this -> cacheFileName );
    if ( $cTime + $this -> cacheLimitTime > time () ) {
    echo file_get_contents ( $this -> cacheFileName );
    ob_end_flush ();
    exit ;
   }
   }
    return false ;
}

function caching( $staticFileName = "" ){
    if ( $this -> cacheFileName ) {
    $cacheContent = ob_get_contents ();
    // echo $cacheContent;
    ob_end_flush ();

    if ( $staticFileName ) {
    $this -> saveFile( $staticFileName , $cacheContent );
   }

    if ( $this -> cacheLimitTime )
    $this -> saveFile( $this -> cacheFileName , $cacheContent );
   }
}

function clearCache( $fileName = " all " ) {
    if ( $fileName != " all " ) {
    $fileName = $this -> cacheRoot . strtoupper ( md5 ( $fileName )) . " . " . $this -> cacheFileExt;
    if ( file_exists ( $fileName ) ) {
    return @ unlink ( $fileName );
   } else return false ;
   }
    if ( is_dir ( $this -> cacheRoot ) ) {
    if ( $dir = @ opendir ( $this -> cacheRoot ) ) {
    while ( $file = @ readdir ( $dir ) ) {
    $check = is_dir ( $file );
    if ( ! $check )
   @ unlink ( $this -> cacheRoot . $file );
   }
   @ closedir ( $dir );
    return true ;
   } else {
    return false ;
   }
   } else {
    return false ;
   }
}

function getCacheFileName() {
    return $this -> cacheRoot . strtoupper ( md5 ( $_SERVER [ " REQUEST_URI " ])) . " . " . $this -> cacheFileExt;
}

function getFileCreateTime( $fileName ) {
    if ( ! trim ( $fileName ) ) return 0 ;

    if ( file_exists ( $fileName ) ) {
    return intval ( filemtime ( $fileName ));
   } else return 0 ;
}

function saveFile( $fileName , $text ) {
    if ( ! $fileName || ! $text ) return false ;

    if ( $this -> makeDir( dirname ( $fileName ) ) ) {
    if ( $fp = fopen ( $fileName , " w " ) ) {
    if ( @ fwrite ( $fp , $text ) ) {
    fclose ( $fp );
    return true ;
   } else {
    fclose ( $fp );
    return false ;
   }
   }
   }
    return false ;
}

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 ;
}
}
?>

来源：合肥网产品小组 http://lab.wehefei.com

转载于:https://www.cnblogs.com/jincon/archive/2010/08/06/1794448.html