PHP preg_replace with \s working different in windows?

[Boboli]

On linux (not xampp) the code working fine, but localhost on windows 10 xampp 7.2.7(7.2.1 too) I have trouble with unicode or german umlauts (ä ö ü).

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$text = 'a  Ž b  c   d e';

Output working fine:

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echo htmlspecialchars($text, ENT_QUOTES, 'UTF-8', TRUE);

Now I want replace spaces with a single underscore.

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$text = preg_replace('/\s\s+/', '_', $text);

Output with echo $text show me

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a_�_b_c_d e

The second character is now unknown. Output with

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var_dump(htmlspecialchars($text, ENT_QUOTES, 'UTF-8', TRUE))

show now as result string(0) ""

Add modifier u to preg_replace('/\s\s+/u', '_', $text) the result is correct with string(12) "a_Ž b_c_d e".
In Linux its working without modifier u. https://regex101.com/r/sNIxdn/1/
When I use instead \s only a space and without modifier u: preg_replace('/ +/', '_', $text) its working too on windows 10. But this replace all spaces, not only minimum two spaces.
What is the issue with preg_replace() and \s on windows with unicode and umlauts?

[Nobbie]

If i remember correctly, this is a well known bug in a 32-bit environment. I have a very similar problem in my forum running with SMF, the PMs (private messages) are mailed to the users and in this email the text is empty, if there is an umlaut in that text. I could break down the problem to the same preg_replace bug. That forum runs in a 32bit Linux(!) environment, therefore i think its due to 32bit and not due to Windows. There is no known fix for that problem (i.e. change the system).

[Boboli]

Ah, yes xampp for windows is 32 Bit and my online system is linux 64 Bit. Thanks for this hint.

Xampp for windows version 7.2.x not planning a 64 Bit version?

[Nobbie]

Xampp for windows version 7.2.x not planning a 64 Bit version?

I dont think so.