How to predefine ID number using PHP ?

Question

I want create a database where ID number supposed to be (current date + n) like 2703191-2704192-2703193... -270319n...

Answer 1

Why do you want to do something like that ?
I think it is better to use two separate fields
one to save the id (auto increment field , indexed column as primary key)
and one to save the current date.

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If you want something like that you describe I think that you have to create a sequence.
And then create a trigger after insert for each row to set the concatenated value you want.