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Informations about the package
IDNA Convert - pure PHP IDNA converter
Project homepage: http://idnaconv.net
by Matthias Sommerfeld [email protected]
Introduction
The library IdnaConvert allows to convert internationalized domain names (see RFC 3492, RFC 5890, RFC 5891, RFC 5892, RFC 5893, RFC 5894, RFC 6452, for details) as they can be used with various registries worldwide to be translated between their original (localized) form and their encoded form as it will be used in the DNS (Domain Name System).
The library provides two classes (ToIdn and ToUnicode respectively), which expose three public methods to convert between the respective forms. See the Example section below.
This allows you to convert host names (simple labels like localhost or FQHNs like some-host.domain.example), email addresses and complete URLs.
Errors, incorrectly encoded or invalid strings will lead to various exceptions. They should help you to find out, what went wrong.
Unicode strings are expected to be UTF-8 strings. ACE strings (the Punycode form) are always 7bit ASCII strings.
Installation
Via Composer
Official ZIP Package
The official ZIP packages are discontinued. Stick to Composer or GitHub to acquire your copy, please.
Upgrading from a previous version
See the upgrading notes to learn about upgrading from a previous version.
Examples
Example 1.
Say we wish to encode the domain name nörgler.com:
Example 2.
We received an email from a internationalized domain and are want to decode it to its Unicode form.
Example 3.
The input is read from a UCS-4 coded file and encoded line by line. By appending the optional second parameter we tell enode() about the input format to be used
Example 4.
We wish to convert a whole URI into the IDNA form, but leave the path or query string component of it alone. Just using encode() would lead to mangled paths or query strings. Here the public method convertUrl() comes into play:
Example 5.
Per default, the class converts strings according to IDNA version 2008. To support IDNA 2003, the class needs to be invoked with an additional parameter.
Encoding helper
In case you have strings in encodings other than ISO-8859-1 and UTF-8 you might need to translate these strings to UTF-8 before feeding the IDNA converter with it.
PHP's built in functions utf8_encode() and utf8_decode() can only deal with ISO-8859-1.
Use the encoding helper class supplied with this package for the conversion. It requires either iconv, libiconv or mbstring installed together with one of the relevant PHP extensions. The functions you will find useful are
toUtf8() as a replacement for utf8_encode() and
fromUtf8() as a replacement for utf8_decode().
Example usage:
UCTC — Unicode Transcoder
Another class you might find useful when dealing with one or more of the Unicode encoding flavours. It can transcode into each other:
- UCS-4 string / array
- UTF-8
- UTF-7
- UTF-7 IMAP (modified UTF-7)
All encodings expect / return a string in the given format, with one major exception: UCS-4 array is just an array, where each value represents one code-point in the string, i.e. every value is a 32bit integer value.
Example usage:
Run PHPUnit tests
The library is supplied with a docker-compose.yml, that allows to run the supplied tests. This assumes, you have Docker installed and docker-compose available as a command. Just issue
in you local command line and see the output of PHPUnit.
Reporting bugs
Please use the issues tab on GitHub to report any bugs or feature requests.
Contact the author
For questions, bug reports and security issues just send me an email.
algo26 Beratungs GmbH
c/o Matthias Sommerfeld
Zedernweg 1
D-16348 Wandlitz
Germany
mailto:[email protected]
