PHP检查文件是否在使用中
问题描述：
我想建立一个平面文件数据库，该数据库将使用.php文件存储网站中的数据.我唯一的问题是，如果当我从平面文件数据库中选择"某项(这意味着已读取文件)，并且在那一刻正在进行更新"(这意味着该文件已被修改并写入)，该文件将空白，我丢失了所有内容.
I want to make a flat files database which will use .php files to store data from the website. My only problem is that if when I 'select' something from the flatfile database (that means the file is read), if in that moment a 'update' is in progress (that means the file is modified and written), the file gets blank and I lose all the content.
我考虑了一下，检查文件是否正在使用中，如果正在使用，请等待几毫秒，然后再次检查.
I thought about something, to check if the file is in use at the moment, and if it is, to wait a couple of milliseconds and check again.