GoLang streamWrapper::stream_lock

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PHP streamWrapper::stream_lock

PHP original manual for streamWrapper::stream_lock [ show | php.net ]


(PHP 5, PHP 7)

streamWrapper::stream_lockAdvisory file locking


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).



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.


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

See Also