This tutorial will explain about online polling or survey system in php, mysql and ajax. Commonly most of the website using polling system to get opinion about any topic. This polling system mainly used in News Website, Social website or any other web portals to get the user opinion. Here you can get your viewer opinion on a specific topic. This system can be used as a survey system. Currently several website doing online survey. So this code is very useful for those who want to make their own polling system.