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idn_to_ascii

PHP function Edit on GitHub ✎

(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.2, PECL idn >= 0.1)

Convert domain name to IDNA ASCII form

Description

Procedural

idn_to_ascii(string $domain, int $flags = IDNA_DEFAULT, int $variant = INTL_IDNA_VARIANT_UTS46, array $idna_info = null): string|false

This function converts a Unicode domain name to an IDNA ASCII-compatible format in lowercase.

domain: The domain to convert, which must be UTF-8 encoded.
flags: Conversion options - combination of IDNA_* constants (except IDNA_ERROR_* constants).
variant: Either INTL_IDNA_VARIANT_2003 (deprecated as of PHP 7.2.0) for IDNA 2003 or INTL_IDNA_VARIANT_UTS46 (only available as of ICU 4.6) for UTS #46.
idna_info: This parameter can be used only if INTL_IDNA_VARIANT_UTS46 was used for variant. In that case, it will be filled with an array with the keys 'result', the possibly illegal result of the transformation, 'isTransitionalDifferent', a boolean indicating whether the usage of the transitional mechanisms of UTS #46 either has or would have changed the result and 'errors', which is an int representing a bitset of the error constants IDNA_ERROR_*.

The domain name encoded in ASCII-compatible form, Falseforfailure

Version	Description
8.4.0	Now throws a `ValueError` if the `domain` parameter is empty.
8.4.0	Now throws a `ValueError` if the `variant` parameter is not `INTL_IDNA_VARIANT_UTS46`.
7.4.0	The default value of `variant` is now `INTL_IDNA_VARIANT_UTS46` instead of the deprecated `INTL_IDNA_VARIANT_2003`.
7.2.0	`INTL_IDNA_VARIANT_2003` has been deprecated; use `INTL_IDNA_VARIANT_UTS46` instead.

php

<?php

echo idn_to_ascii('täst.de'); 

?>

The above example will output:

output

xn--tst-qla.de

All-ASCII domain names are just converted to lowercase

php

<?php

var_dump(idn_to_ascii('Example.com'));

?>

The above example will output:

output

string(11) "example.com"