This method returns TRUE on custom wrappers by default if you don't implement the stream_lock() method inside the wrapper : http://php.net/manual/en/streamwrapper.stream-lock.php
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
stream_supports_lock — Tells whether the stream supports locking
Tells whether the stream supports locking through flock().
stream
The stream to check.
Restituisce true
in caso di successo, false
in caso di fallimento.
This method returns TRUE on custom wrappers by default if you don't implement the stream_lock() method inside the wrapper : http://php.net/manual/en/streamwrapper.stream-lock.php