写入缓存时机

在 function_core.php 的 output() 函数中，相关代码为：

if(defined('CACHE_FILE') && CACHE_FILE && !defined('CACHE_FORBIDDEN') && !defined('IN_MOBILE') && !checkmobile()) {
		if(diskfreespace(DISCUZ_ROOT.'./'.$_G['setting']['cachethreaddir']) > 1000000) {
			if($fp = @fopen(CACHE_FILE, 'w')) {
				flock($fp, LOCK_EX);
				fwrite($fp, empty($content) ? ob_get_contents() : $content);
			}
			@fclose($fp);
			chmod(CACHE_FILE, 0777);
		}
	}

output 函数在所有的 footer.htm 都有调用

所以之前要有定义 CACHE_FILE 这个全局常量。

定义 CACHE_FILE 的位置有两处：

1:

forum_index.php 的 get_index_page_guest_cache() 函数，相关代码：

if(TIMESTAMP - $indexcache['filemtime'] > $_G['setting']['cacheindexlife']) {
		@unlink($indexcache['filename']);
		define('CACHE_FILE', $indexcache['filename']);

2:

forum_viewthread.php 的 viewthread_loadcache() 函数，相关代码：

$_G['forum']['livedays'] = ceil((TIMESTAMP - $_G['forum']['dateline']) / 86400);
	$_G['forum']['lastpostdays'] = ceil((TIMESTAMP - $_G['forum']['lastthreadpost']) / 86400);
	$threadcachemark = 100 - (
		$_G['forum']['displayorder'] * 15 + 
		$_G['thread']['digest'] * 10 +
		min($_G['thread']['views'] / max($_G['forum']['livedays'], 10) * 2, 50) +
		max(-10, (15 - $_G['forum']['lastpostdays'])) +
		min($_G['thread']['replies'] / $_G['setting']['postperpage'] * 1.5, 15));

	if($threadcachemark < $_G['forum']['threadcaches']) {
		$threadcache = getcacheinfo($_G['tid']);
		if(TIMESTAMP - $threadcache['filemtime'] > $_G['setting']['cachethreadlife']) {
			@unlink($threadcache['filename']);
			define('CACHE_FILE', $threadcache['filename']);