- filter_var: documentation ( source)
<?php
filter_var('nonsense.something@dottiness', FILTER_VALIDATE_EMAIL);
filter_var('dotty@something.whatever', FILTER_VALIDATE_EMAIL);
filter_var('lorna..jane@gmail.com', FILTER_VALIDATE_EMAIL);
filter_var('lornajaneaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@gmail.com', FILTER_VALIDATE_EMAIL);