Concatenate String Constant with auto incremented integer and store in mysql database

Question

I want to Store something like this in userID of Database(DDN00000001,DDN00000002,DDN00000003 and so on , as user ID)

How to concatenate the string in front of integer and store in database.

Answer 1

If you want to convert integer identifiers to this form in PHP, before sending it to the database, you can use str_pad :

$user_id = 1;
$padded_user_id = 'DDN' . str_pad ($user_id, 8, '0', STR_PAD_LEFT);