php html 静态化 缓存

<?php
// // ob_start();
$cache_name = md5(__FILE__). '.html';
$cache_lifetime = 3600;
// echo filectime(__FILE__)."<br>";
// echo filectime($cache_name)."<br>";
// echo file_exists($cache_name)."<br>";
// echo filectime($cache_name)+$cache_lifetime."<br>";
// echo $cache_lifetime."<br>";
// echo time();
if(filectime(__FILE__) <= filectime($cache_name) && file_exists($cache_name) && filectime($cache_name) + $cache_lifetime > time())
{
    exit('123');
    include $cache_name;
    exit;
}
ob_start();

 ?>

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<?php
$content = ob_get_contents();
ob_end_flush();
$handle = fopen($cache_name, 'w');
fwrite($handle, $content);
fclose($handle);
?>