system/Session/Handlers/FileHandler.php
public function close(): bool
	{
		if (is_resource($this->fileHandle))
		{
			flock($this->fileHandle, LOCK_UN);
			fclose($this->fileHandle);

			$this->fileHandle = $this->fileNew = $this->sessionID = null;

			return true;
		}

		return true;
	}
public function close(): bool
	{
		if (is_resource($this->fileHandle))
		{
			flock($this->fileHandle, LOCK_UN);
			fclose($this->fileHandle);

			$this->fileHandle = $this->fileNew = $this->sessionID = null;

			return true;
		}

		return true;
	}
Close

Releases locks and closes file descriptor.

@return boolean