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Editorial Team
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Asked: 2026-05-26T18:00:20+00:00

I do not have that much control of the remote server to install extensions,

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I do not have that much control of the remote server to install extensions, php is 5.3.8.
But I’ve noticed that there is possible to split utf-8 string with pcre.

So for example: preg_split('@@u','bücher',-1,PREG_SPLIT_NO_EMPTY);

gives: Array ( [0] => b, [1] => ├╝, [2] => c, [3] => h, [4] => e, [5] => r )

or for chinese word: 中国/中华 it gives: Array ( [0] => ńŞş, [1] => ňŤŻ, [2] => /, [3] => ńŞş, [4] => ňŹÄ )

(the results are from non-unicode display), but it is clear that it is possible to split an utf-8 string without international extensions and then (I think) it should be possible to get character codes and do calculations with them to create ascii url.

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1 Answer

  1. Editorial Team

    The only things you need to know is the bitmasks that signal double,triple,quad byte code points:

    Table from http://en.wikipedia.org/wiki/UTF-8

    Bits  Last Code Point  Octet 1  Octet 2  Octet 3  Octet 4

 7    U+007F           0xxxxxxx    -/-      -/-      -/-
11    U+07FF           110xxxxx 10xxxxxx    -/-      -/-
16    U+FFFF           1110xxxx 10xxxxxx 10xxxxxx    -/-
21    U+10FFFF         11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

    I don’t speak php, but I’m quite sure existing code can be found that uses the shown bitmasks to scan a utf-8 char sequence without actually interpreting it

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