streamWrapper::stream_lock

(PHP 5, PHP 7)

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).

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-streamwrapper.stream-lock.html

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References

Manuel PHP : http://php.net

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