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<?php $user_data['email'] = 'aaaa@bbb.com'; var_dump(substr($user_data['email'], strpos($user_data['email'], '@')+1));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(7) "bbb.com"