(PECL inotify >= 0.1.2)
inotify_add_watch — Add a watch to an initialized inotify instance
inotify_add_watch ( resource $inotify_instance , string $pathname , int $mask ) : int
inotify_add_watch() adds a new watch or modify an existing watch for the file or directory specified in pathname.
Using inotify_add_watch() on a watched object replaces the existing watch. Using the IN_MASK_ADD constant adds (OR) events to the existing watch.
inotify_instance
Resource returned by inotify_init()
pathname
File or directory to watch
mask
Events to watch for. See Predefined Constants.
The return value is a unique (inotify instance wide) watch descriptor.
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https://www.php.net/manual/en/function.inotify-add-watch.php