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$ssdir = $DOCUMENT_ROOT."/_session" ;
$idletime = 10800 ;    // Áö¿¬½Ã°£ 3½Ã°£

function CreateSession($id) {
    global $ssdir ;
    global $idletime ;
    global $_SERVER ;


    // unique ½Äº°ÀÚ ¹ß»ý
    $ssid = "" ;
    for( $i = 1 ; $i <= 8 ; $i++ ) {
        mt_srand((double)microtime()*1000000) ;
        do {
            $randval = mt_rand(48,122) ;
        } while ( ( 58 <= $randval && 64 >= $randval ) || ( 91 <= $randval && 96 >= $randval ) ) ;
        $ssid .= chr($randval) ;
    }

    $ipaddr = $_SERVER["REMOTE_ADDR"] ;
    $sskey = $id."_".$ssid."_".$ipaddr ;    // ¼¼¼Ç»ý¼º¿Ï·á
    for( $i = 0 ; $i < strlen($id) ; $i++ ) $ssdir .= "/".$id[$i] ;
    $ssfile = $ssdir ."/".$sskey ;        // ¼¼¼ÇÆÄÀϸí

    // µð·ºÅ丮»ý¼º
    $tmpdir = $ssdir ;
    for( $i = 0 ; $i < strlen($id) ; $i++ ) {
        $tmpdir .= "/".$id[$i] ;
        if( !is_dir($tmpdir) )    mkdir($tmpdir,0775) ;
        clearstatcache() ;
    }


    // µ¿ÀÏ ID ÀÇ ¼¼¼ÇÈ­ÀÏÀÌ Á¸ÀçÇÏ´ÂÁö È®ÀÎ

    $hd = opendir($tmpdir) ;
    while( $filename = readdir($hd) ) {
        clearstatcache() ;
        if( filetype( $tmpdir."/".$filename ) == "dir" ) continue ;    // µð·ºÅ丮¸é ¹«½ÃÇÑ´Ù.
        clearstatcache() ;
        if( preg_match( "/^$id_/", $filename ) )    {            // µ¿ÀÏ ID ÀÇ ¼¼¼ÇÈ­ÀÏÀÌ Á¸ÀçÇÑ´Ù¸é
            $mtime = filemtime($tmpdir."/".$filename) ;        // ¼¼¼ÇÈ­ÀÏÀÇ modify ½Ã°£À» ±¸ÇÑ´Ù.
            $ctime = time() ;// ÇöÀç½Ã°£À» ±¸ÇÑ´Ù.
            if( ($ctime - $mtime) < $idletime ) {                    // idletime À» ÃÊ°úÇÏ´ÂÁö È®ÀÎ
                closedir($hd) ;
                $prev = preg_split("/_/", $filename) ;            // ÀÌÀü »ç¿ëÀÚÀÇ ssid ¸¦ ±¸ÇÑ´Ù.

                if($_member_code){    
                    ## ÀÌ¹Ì ´Ù¸¥ »ç¿ëÀÚ°¡ Á¢¼ÓÁßÀ̰ųª ·Î±×¾Æ¿ôÀÌ Á¦´ë·Î µÇÁö ¾Ê¾ÒÀ½À» ¾Ë·ÁÁÖ´Â °æ°í¸Þ½ÃÁö
                }
            }
            else
                unlink($tmpdir."/".$filename) ;            // idletime À» ³Ñ±ä °æ¿ì ÀÌÀü¼¼¼ÇÈ­ÀÏ »èÁ¦
            break ;
        }
    }
    @closedir($hd) ;

    touch($ssfile) ;            // ¼¼¼ÇÈ­ÀÏ»ý¼º
                        // print "¼¼¼ÇÅ°È­Àϸí : $ssfile, $tmpdir" ;
    setcookie("sskey", $sskey, 0, "/" ) ;
}


function SessionCheck() {
    global $ssdir ;
    global $idletime ;
    global $_COOKIE ;

    $sskey = $_COOKIE[sskey] ;
    // ¼¼¼ÇÀÌ Á¸ÀçÇÏÁö ¾Ê´Â °æ¿ì °æ°í¸Þ¼¼Áö
    if( $sskey == NULL ){
        ## °æ°í ¸Þ½ÃÁö ÈÄ ·Î±×ÀÎ ÆäÀÌÁö·Î À̵¿
    }

    $tmp = preg_split("/_/", $sskey) ;
    $id = $tmp[0] ;                // »ç¿ëÀÚÀÇ id ¸¦ ±¸ÇÑ´Ù.
    for( $i = 0 ; $i < strlen($id) ; $i++ ) $ssdir .= "/".$id[$i] ;
    $ssfile = $ssdir ."/".$sskey ;        // ¼¼¼ÇÆÄÀϸí
    clearstatcache() ;
    if( file_exists($ssfile) ) {        // ¼¼¼ÇÆÄÀÏÀÌ Á¸ÀçÇÏ´Â °æ¿ì
        $mtime = filemtime($ssfile) ;        // ¼¼¼ÇÈ­ÀÏÀÇ modify ½Ã°£À» ±¸ÇÑ´Ù.
        $ctime = time() ;            // ÇöÀç½Ã°£À» ±¸ÇÑ´Ù.
        if( ($ctime - $mtime) < $idletime )
            touch($ssfile) ;        // idletime À» ÃÊ°úÇÏÁö ¾Ê´Â °æ¿ì file ¼öÁ¤½Ã°£ °»½Å
        else {
            ## 3½Ã°£ ÀÌ»ó »ç¿ë¾øÀ¸¹Ç·Î °æ°í ¸Þ½ÃÁö¹× ·Î±×ÀÎ ÆäÀÌÁö·Î À̵¿
        }
    }else{
        ## ¼¼¼ÇÆÄÀÏÀÌ Á¸ÀçÇÏÁö ¾Ê´Â °æ¿ì ·Î±×¾Æ¿ô ÆäÀÌÁö·Î À̵¿
    }
}
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