streamWrapper
PHP Manual

streamWrapper::stream_lock

Advisory file locking

Description

public bool streamWrapper::stream_lock(int $operation)

This method is called in response to flock, when file_put_contents (when flags contains LOCK_EX), stream_set_blocking and when closing the stream (LOCK_UN).

Parameters

operation

operation is one of the following:

  • LOCK_SH to acquire a shared lock (reader).
  • LOCK_EX to acquire an exclusive lock (writer).
  • LOCK_UN to release a lock (shared or exclusive).
  • LOCK_NB if you don't want flock to block while locking. (not supported on Windows)

Return Values

Returns true on success or false on failure.

Errors/Exceptions

Emits E_WARNING if call to this method fails (i.e. not implemented).

See Also

  • stream_set_blocking
  • flock