	public function start()
	{
		if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
			if (session_status() !== PHP_SESSION_ACTIVE) {
				session_start();
			}
		} else {
			set_error_handler(array($this, 'session_start_error'),  E_NOTICE);
			session_start();
			restore_error_handler();
		}
		$this->started = session_id()? true : false;
		
		return $this;
	}
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.