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Content type: text/markdown
Description: Auxiliary data
Class: IDNA Convert
Convert from and to IDNA Punycode domain names
Author: By
Last change: upgrading: fix table rendering in github (#25)

Date: 11 months ago
Size: 3,440 bytes



Upgrading from previous versions


The library has been broken down into various specific classes, thus more closely following SOLID principles.

As such the single class IdnaConvert has been broken down into ToIdn and ToUnicode respectively. Their naming reflects the format of the outcome, so it's more clear to distinguish, what you need. This should be easier to grasp then the old method names encode() and decode(). Usually you will only need one conversion direction per script run, so why bother loading and parsing all the other unused code, then?

Also the handling of host names (simple labels like my-hostname or FQHNs like is now separated from that of email addresses and URLs. Both classes offer the same set of public methods:

| Method | | |-------------------------|-------------------------------------| | convert() | To convert host names | | convertEmailAddress() | To convert email addresses | | convertUrl() | To convert the host name of an URL |

There's no "strict mode" anymore, this is achieved by the separate methods above. The IDN version is selected when instantiating the class, no more setting during runtime. Also the encoding (for the Unicode side of things) is now always UTF-8. Use TransCodeUnicode or EncodingHelper for converting to and from various encodings to UTF-8.

All actual sub classes like that for NamePrep and the actual Punycode transformation are put in their own namespaces under Algo26\IdnaConvert, e.g. Algo26\IdnaConvert\NamePrep. Interfaces and Exceptions also have their own namespace to declutter the class structure even more.

The class EncodingHelper is now called separated into the two classes ToUtf8 and FromUtf8 respectively and lies under the namespace Algo26\idnaConvert\EncodingHelper. The class UnicodeTranscoder is now called TransCodeUnicode under the namespace Algo26\idnaConvert\TransCodeUnicode.

All examples are updated to reflect the new usage. See the ReadMe for more details.

Also the minimum PHP version is now 7.2.


The library has been handed over to actively maintained GitHub and Packagist accounts. This lead to a change in the namespace. Replace all occurrences of Mso\IdnaConvert or PhlyLabs\IdnaConvert to Algo26\IdnaConvert. There's no further changes to the class signatures.


BC break: As of version 1.0.0 the class closely follows the PSRs PSR-1, PSR-2 and PSR-4 of the PHP-FIG. As such the classes' naming has been changed, a namespace has been introduced and the default IDN version has changed from 2003 to 2008 and minimum PHP engine version raised to 5.6.0.


As of version 0.8.0 the class fully supports IDNA 2008. Thus the aforementioned parameter is deprecated and replaced by a parameter to switch between the standards. See the updated example 5 in the ReadMe.


BC break: As of version 0.6.4 the class per default allows the German ligature ß to be encoded as the DeNIC, the registry for .DE allows domains containing ß.


ATTENTION: As of version 0.6.0 this class is written in the OOP style of PHP 5. Since PHP 4 is no longer actively maintained, you should switch to PHP 5 as fast as possible. We expect to see no compatibility issues with the upcoming PHP 6, too.

For more information send a message to info at phpclasses dot org.