Array stristr version

array-stristr.php

$illegal_domain_names = array(
  'gmail.con',
  'gamil.com',
  'gail.com',
  'gmil.com',
  'gmail.co',
  'hotnail.com',
  'hormail.com',
  'hotmail.con',
  'hotmil.com',
  'hotmial.com',
  'hotmial.com',
  'hotmail.cm',
);
if(preg_match('/' . implode('|', array_map('preg_quote', $illegal_domain_names)) . '/i', $email)) {
  //Illegal domainname
}