php unique identifier for clients
you need to remove the "." (dot) in your function. you are probably using an INT which remove numbers after the dot.
return str_replace('.', '', date('dmYHis').$duration);
and make sure the field is big enough - like varchar(50)
my recommendation will be to simply hash the client id using md5
md5($clientid)
and you have the mysql field as a char(32)
You've already got your solution in your code. The php function uniqid() provides... well, a unique ID. If you want to ensure it's really really really really unique (though it's not necessary), just append time() to the end, like so:
return uniqid().time();This would also return letters mixed in with numbers (higher entropy), like this response:
4eb8895a76edc1320716634