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PHP idn_to_ascii

PHP original manual for idn_to_ascii [ show | php.net ]


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

idn_to_asciiConvert domain name to IDNA ASCII form


Procedural style

string idn_to_ascii ( string $domain [, int $options = IDNA_DEFAULT [, int $variant = INTL_IDNA_VARIANT_2003 [, array &$idna_info ]]] )

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



The domain to convert, which must be UTF-8 encoded.


Conversion options - combination of IDNA_* constants (except IDNA_ERROR_* constants).


Either INTL_IDNA_VARIANT_2003 for IDNA 2003 or INTL_IDNA_VARIANT_UTS46 for UTS #46.


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_*.

Return Values

The domain name encoded in ASCII-compatible form, or FALSE on failure


Version Description
7.2.0 INTL_IDNA_VARIANT_2003 has been deprecated; use INTL_IDNA_VARIANT_UTS46 instead.
5.4.0/PECL 2.0.0b1 Added the parameters variant and idna_info; UTS #46 support.


Example #1 idn_to_ascii() example


echo idn_to_ascii('täst.de'); 


The above example will output:


See Also