define('cache_time', 1); // 캐싱 5분
define('cache_dir', G5_PATH."/cache/"); // 폴더 경로
define('cache_prefix', "g5_cache_"); // 접두사
function cache_state($cache_name){
    $cache_file = cache_prefix.$cache_name.".php";
    if(is_file(cache_dir.$cache_file) == 1){
        if((time()-filemtime(cache_dir.$cache_file)) >= cache_time*60){
            $cache_state = true;
        }
    }else{
        $cache_state = true;
    }
    return $cache_state;
}
function cache_write($cache_name, $cache_content=""){
    $cache_file = cache_prefix.$cache_name.".php";
    if($cache_content){
  $cache = fopen(cache_dir.$cache_file, "w");
     fwrite($cache, $cache_content);
     fclose($cache);
        $Return = $cache_content;
 }else{
  ob_start();
  include_once(cache_dir.$cache_file);
  $Return = ob_get_contents();
  ob_end_clean();
    }
    return $Return;
}
ob_start();
echo "동해물과 백두산이 마르고 닳도록";
$Content = ob_get_contents();
ob_end_clean();
$cache_name = "main2";
if(cache_state($cache_name)){
 echo cache_write($cache_name, $Content);
}else{
 echo cache_write($cache_name);
}