Description:
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The description for flag '%s' says:

> An optional number, a width specifier that says how many characters (minimum) this conversion should result in.

This is incorrect. The number specifies bytes count, not characters. With multibyte encodings such as utf-8, the right aligned text gets aligned wrong. And sprintf doesn't have an option to specify encoding so it cannot calculate text width anyway.

I think there should be something like a red warning saying that width specifier for %s will not work correctly with utf-8 (which is very popular  encoding) and would be better not used at all.

I have tested the script on Windows and on Debian Linux (with LANG=en_US.UTF-8) and it works incorrectly on both systems.

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From manual page: http://www.php.net/function.sprintf
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Test script:
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<?php

// The strings should be aligned at the same width
printf("%10s\n%10s\n%10s\n",  "Привет", "Hello", "おはよう");


Expected result:
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Text in all strings is aligned to the right and every line has at least 10 characters:

    Привет
     Hello
      おはよう


Actual result:
--------------
Non-latin text is aligned to the left

Привет
     Hello
おはよう

The string with text «Привет» has only 6 characters (that take 12 bytes in utf-8) and is not padded with 4 spaces as it should be.