WampServer

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\wamp64\www\Registration\registration.php

Hi,

Please: READ BEFORE YOU ASK A QUESTION

Note : mysql does not exist with PHP 7.0.x. Use mysqli.

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Documentation Apache - Documentation PHP - Documentation MySQL - Wampserver install files & addons

The MYSQL_* database extension has been deprecated for years and is gone for ever in PHP7.
I assume you are using PHP7!

If you are just learning PHP, spend your energies learning the `PDO` or `mysqli` database extensions.
[Start here](http://php.net/manual/en/book.pdo.php)

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