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<?php // PHP 7.3.x $result=idn_to_ascii('.pm--domain.com', IDNA_DEFAULT, INTL_IDNA_VARIANT_2003); var_dump(intl_get_error_code()); // 66567 var_dump(intl_get_error_message()); // idn_to_ascii: cannot convert to ASCII: U_IDNA_ZERO_LENGTH_LABEL_ERROR // PHP 7.4.x $result=idn_to_ascii('.pm--domain.com.', IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46, $data); var_dump(intl_get_error_code()); // 0 var_dump(intl_get_error_message()); // U_ZERO_ERROR var_dump($data); /**array(3) { ["result"]=> string(16) ".pm--domain.com." ["isTransitionalDifferent"]=> bool(false) ["errors"]=> int(33) }*/