Is there any way so that a machine could be identified uniquely in PHP. I am making a voting site. And client's requirement is to vote from a machine once a day.
1)Machines sharing same IP in lan should be identified uniquely.
2)On the other hand when using a single machine one can vote from several browsers. It should not be done. Otherwise one can use the same browser to vote again and again deleting cookie sessions etc. It also should not be done.
If there is no way to fix the above points then is there any alternative way to do the same.