1. ((http://doc.cat-v.org/plan_9/4th_edition/papers/utf The original paper from Bell Labs on UTF-8))
2. **((http://jkorpela.fi/chars.html A tutorial on character code issues))** - the MUST READ
3. ((https://en.wikipedia.org/wiki/Mojibake Mojibake))
2. ((https://web.archive.org/web/20070622045515/http://www.phpwact.org/php/i18n/charsets Character Sets / Character Encoding Issues))
3. ((https://web.archive.org/web/20070622045515/http://www.phpwact.org/php/i18n/utf-8 Handling UTF-8 with PHP))
1. ((http://www.w3.org/International/articles/unicode-migration/ Migrating to Unicode))
4. http://en.wikipedia.org/wiki/UTF-8
5. ((https://en.wikipedia.org/wiki/Unicode_block Unicode block))
5. **((/Dev/Guidelines/UnicodeCheatSheet Unicode Cheat Sheet))**
5. http://htmlpurifier.org/docs/enduser-utf8.html
1. ((http://kunststube.net/encoding/ What every programmer absolutely, positively needs to know about encodings and character sets to work with text))
6. https://www.sitepoint.com/bringing-unicode-to-php-with-portable-utf8/
6. **https://www.utf8-chartable.de/**
7. W3C: ((http://www.w3.org/TR/charmod-norm/ Character Model for the World Wide Web: String Matching))
7. https://unicode.org
6. ((https://unicode.org/reports/tr18/ Unicode Regular Expressions))
7. ((https://unicode.org/reports/tr9/ Unicode Bidirectional Algorithm))
9. ((https://unicode.org/reports/tr36/tr36-9.html#visual_spoofing Unicode Security Considerations))
10. ((http://unicode.org/reports/tr15/ Unicode Normalization Forms))
7. http://www.utf8everywhere.org/
2. ((Quotes Quotes))
%%(info type="example")
̲ᴛ̲ʜ̲ᴇ̲ʀ̲ᴇ̲ ̲ɪ̲s̲ ̲ɴ̲ᴏ̲ ̲U̲ɴ̲ɪ̲ᴄ̲ᴏ̲ᴅ̲ᴇ̲ ̲ᴍ̲ᴀ̲ɢ̲ɪ̲ᴄ̲ ̲ʙ̲ᴜ̲ʟ̲ʟ̲ᴇ̲ᴛ̲ ̲
💩 𝔸 𝕤 𝕤 𝕦 𝕞 𝕖 𝔹 𝕣 𝕠 𝕜 𝕖 𝕟 𝕟 𝕖 𝕤 𝕤 💩
😈 ¡ƨdləɥ ƨᴉɥʇ ədoɥ puɐ ʻλɐp əɔᴉu ɐ əʌɐɥ ʻʞɔnl poo⅁ 😈
%%
PHP 7.x/8.x
* Strings literals in PHP are still fundamentally composed of bytes.
* It is up to developers to deal with character encoding issues using ((https://www.php.net/manual/en/book.mbstring.php mbstring)), ((https://www.php.net/manual/en/book.iconv.php iconv)), ((https://www.php.net/manual/en/class.uconverter.php uconverter)), etc.
* The ((https://www.php.net/manual/en/book.intl.php intl extension)) wraps a lot of the functionality that was originally going to be a part of PHP 6 for use in PHP 7.x/8.x.
* PHP 7 helps by adding the inline UTF-8 literal syntax ##\u{[0-9A-Fa-f]+}## and ((https://www.php.net/manual/en/class.intlchar.php IntlChar class)).