//开始缓冲区
ob_start();
$cache_file = "./cache/4.3-static.html";
$cache_time = 1; //设置缓存更新时间
if (file_exists($cache_file) && time() - $cache_time < filemtime($cache_file)) {
include($cache_file);
echo "<!--published at " . date("H:i", filemtime($cache_file)) . "by Think Creative CMS -->\n";
exit();
}
echo ‘
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
这是一个缓存文件内容！！
</body>
</html>
‘;
$fp = fopen($cache_file, ‘w‘);
//将输出缓冲区的内容写到文件
fwrite($fp, ob_get_contents());
//关闭文件
fclose($fp);
// 将缓冲区的内容立即输出到浏览器
ob_end_flush();
原文：http://www.cnblogs.com/chengzhi59/p/7419039.html