Does php have a function to determine whether a file is open?

Question

Like the question, if you sometimes need to add content to a file, how can you ensure that what you write will not be opened and written in by another person?

What I want is to generate something randomly before the writing operation starts, and then delete it after the operation is completed;

PHP中文网 · Answer

File Lock

From : http://php.net/manual/zh/func...