FOS\UserBundle\Util\CanonicalizerInterface::canonicalize PHP Method

    function canonicalize($string);

 /**
  * Canonicalizes a username
  *
  * @param string $username
  *
  * @return string
  */
 protected function canonicalizeUsername($username)
 {
     return $this->usernameCanonicalizer->canonicalize($username);
 }