兰特函数值

Question

i create rand funtion for generating random value and concatenate with other value and show in the text field through ajax before insert this value. but here how can i check this random generating value is exists or not in database before inserting this value in database.if value is exists then again generate rand function value and again concatenate this. how can i do this? my code is below

<?php $rand=rand(100000,999999);
$roll=$branch_name.$name.$course.$year.$rand;
echo $roll;
?>

Answer 1

I know that i should explain how its works, but its really a big amount of information about this in google...

In a link below i attached the url for it with some explain:

How create a radio button in html5