Sharmilamega

Hi, i have a doubt in php. I need to store datas in database if i before my time ends. But before timing ends datas are not stored in db. this is my problem. Please give one solution for this.

Can we generate random unique id with alphanumeric in php?

1) why autoincrement is not working for varchar in phpmyadmin? 2)can we set two autoincrement in a table in phpmyadmin?

how to set the timer in descending order in php codings.