PHP浏览次数统计类visit.class.php配合文本缓存

使用示例：
$visit = app::loader('visit'); 
$article_id = 20722; 
$visit->count('article', $article);

expires['article'] = 10;
$this->tables['article'] = 'pcb_article';

$this->expires['forum'] = 9;
$this->tables['forum'] = 'pcb_forum';

$this->expires['blog'] = 8;
$this->tables['blog'] = 'pcb_blog';
}



public function count($channel, $id)
{
$path = $this->get_cache_path($channel);

$this->update($path, $channel, $id);
}


private function get_cache_expires($channel)
{
$expires = isset($this->expires[$channel]) ? $this->expires[$channel] : 10;
return $expires;
}

private function get_cache_path($channel)
{
$time = time();
$minute = date('H', $time) * 60 + date('i', $time);
$expires = $this->get_cache_expires($channel);

$path = SYS_PATH ."/data/cache/visit/{$channel}". ceil($minute / $expires) .".txt";
return $path;
}


private function update($path, $channel, $id)
{
$dir = dirname($path);
if (!file_exists($dir))
make_dir($dir);

if (file_exists($path))
{
file_put_contents($path, ',' . $id, FILE_APPEND|LOCK_EX);
}
else
{
$table = $this->tables[$channel];
$mysql = app::loader('mysql');
$hand = opendir($dir);
while (($file = readdir($hand)))
{
if (preg_match("/{$channel}/", $file))
{
$visit = file_get_contents("{$dir}/{$file}");
$array = explode(',', $visit);
$array = array_count_values($array);
unset($array['']);

$sql = '';
foreach ($array as $id => $visit)
{
$sql .="UPDATE `{$table}` SET `visit` = `visit` + {$visit} WHERE `id` = {$id} LIMIT 1;";
}
if ($sql)
{
$res = $mysql->executes($sql);
if ($res)
unlink($dir . '/' . $file);
}
unset($sql);
}
}

file_put_contents($path, ',' . $id, LOCK_EX);
}
}

}