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All versions of utf8 with dependencies

Informations about the package utf8

Patchwork UTF-8 for PHP

Latest Stable Version Total Downloads Build Status SensioLabsInsight

Patchwork UTF-8 gives PHP developpers extensive, portable and performant handling of UTF-8 and grapheme clusters.

It provides both :

It can also serve as a documentation source referencing the practical problems that arise when handling UTF-8 in PHP: Unicode concepts, related algorithms, bugs in PHP core, workarounds, etc.

Version 1.2 adds best-fit mappings for UTF-8 to Code Page approximations. It also adds Unicode filesystem access under Windows, using preferably wfio or a COM based fallback otherwise.

Portability

Unicode handling in PHP is best performed using a combo of mbstring, iconv, intl and pcre with the u flag enabled. But when an application is expected to run on many servers, you should be aware that these 4 extensions are not always enabled.

Patchwork UTF-8 provides pure PHP implementations for 3 of those 4 extensions. pcre compiled with unicode support is required but is widely available. The following set of portability-fallbacks allows an application to run on a server even if one or more of those extensions are not enabled:

Patchwork\Utf8

Grapheme clusters should always be considered when working with generic Unicode strings. The Patchwork\Utf8 class implements the quasi-complete set of native string functions that need UTF-8 grapheme clusters awareness. Function names, arguments and behavior carefully replicates native PHP string functions.

Some more functions are also provided to help handling UTF-8 strings:

Mirrored string functions are: strlen, substr, strpos, stripos, strrpos, strripos, strstr, stristr, strrchr, strrichr, strtolower, strtoupper, wordwrap, chr, count_chars, ltrim, ord, rtrim, trim, str_ireplace, str_pad, str_shuffle, str_split, str_word_count, strcmp, strnatcmp, strcasecmp, strnatcasecmp, strncasecmp, strncmp, strcspn, strpbrk, strrev, strspn, strtr, substr_compare, substr_count, substr_replace, ucfirst, lcfirst, ucwords, number_format, utf8_encode, utf8_decode, json_decode, filter_input, filter_input_array.

Notably missing (but hard to replicate) are printf-family functions.

The implementation favors performance over full edge cases handling. It generally works on UTF-8 normalized strings and provides filters to get them.

As the turkish locale requires special cares, a Patchwork\TurkishUtf8 class is provided for working with this locale. It clones all the features of Patchwork\Utf8 but knows about the turkish specifics.

Usage

The recommended way to install Patchwork UTF-8 is through composer. Just create a composer.json file and run the php composer.phar install command to install it:

{
    "require": {
        "patchwork/utf8": "~1.2"
    }
}

Then, early in your bootstrap sequence, you have to configure your environment:

Run phpunit to see the code in action.

Make sure that you are confident about using UTF-8 by reading Character Sets / Character Encoding Issues and Handling UTF-8 with PHP, or PHP et UTF-8 for french readers.

You should also get familiar with the concept of Unicode Normalization and Grapheme Clusters.

Do not blindly replace all use of PHP's string functions. Most of the time you will not need to, and you will be introducing a significant performance overhead to your application.

Screen your input on the outer perimeter so that only well formed UTF-8 pass through. When dealing with badly formed UTF-8, you should not try to fix it (see Unicode Security Considerations). Instead, consider it as CP-1252 and use Patchwork\Utf8::utf8_encode() to get an UTF-8 string. Don't forget also to choose one unicode normalization form and stick to it. NFC is now the defacto standard. Patchwork\Utf8::filter() implements this behavior: it converts from CP1252 and to NFC.

This library is orthogonal to mbstring.func_overload and will not work if the php.ini setting is enabled.

Licensing

Patchwork\Utf8 is free software; you can redistribute it and/or modify it under the terms of the (at your option):

Unicode handling requires tedious work to be implemented and maintained on the long run. As such, contributions such as unit tests, bug reports, comments or patches licensed under both licenses are really welcomed.

I hope many projects could adopt this code and together help solve the unicode subject for PHP.


Version
Requires php Version >=5.3.0
lib-pcre Version >=7.3

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