Normally there are confirmation emails during the registration process.
If you are hosting the environment on a hosting provider server (GoDaddy, Web.com, etc), this can easily be done by using the (PHP) method mail(). If you are hosting your own server, you should set this up. If you designed the database, you can also have an approved field in your users table.
If you have a database user tables with first and last, you can also use those as primary keys and do look ups during the registration process.
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