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Added about SJIS and Unicode conversion map in PHP 8.1 #40

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@zonuexe zonuexe commented Apr 5, 2022

This PR is based on discussions in php/php-src#8281 (comment), so I'm still working on it.

Since this issue is related to Japanese, I am submitting a proposal in doc-ja before doc-en.
And my English is poor, so I made a draft in Japanese first.

<entry>8.1.0</entry>
<entry>
SJISの<emphasis>\</emphasis>(<literal>\x5C</literal>) と <emphasis>~</emphasis>(<literal>\x7E</literal>) が
<emphasis>¥</emphasis>(<literal>\u{00A5}</literal>) と <emphasis>‾</emphasis>(<literal>\u{203E}</literal>) に
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文字コードの表記方法は https://www.php.net/manual/language.types.string.php に従いました。前者はバイト、後者はUnicodeのコードポイントに基いているため表記が異なります。

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mumumu commented Apr 6, 2022

「既に変更されてしまっている BC Break をドキュメント化する」という目的であれば、本件の変更は良さそうに見えます。

ただ、php-src 側の議論はまだ続いているようですし、 @zonuexe も still working と述べていることから、状況の推移を見守ることにします。

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