i want user to not enter his/her name twice when he or she once creates his/her account. What code should i write guys tell me??

Answer 1

see his/her details exists in your database , if not then let them create !

ex: if same email / mobile_number trying to create new account

(edit): check username also

Answer 2

ex: user enters (davidmalan87)
he successfully created his account
another user enters(davidmalan87)
he should be unable to create his account

so here what should i need to write 🙂