(PECL sync >= 1.0.0)
SyncReaderWriter::writeunlock — Releases a write lock
public SyncReaderWriter::writeunlock ( ) : bool
Releases a write lock on a SyncReaderWriter object.
This function has no parameters.
A boolean of TRUE if the unlock operation was successful, FALSE otherwise.
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https://www.php.net/manual/en/syncreaderwriter.writeunlock.php