Regular expressions-What do you mean by this regular ' #x {00a0} #siu in PHP?

Found in the code, not quite understand, please master analysis under

$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );

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Found in the code, not quite understand, please master analysis under

$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );

X{00A0} is UTF-8 non-breaking space, this space and the simple keyboard on the space key to knock out the same, even the naked eye can not tell, if you look in the editor, you will find the problem.

$filename = preg_replace( "/#\x{00a0}#siu/u", ' ', $filename );

This is an introduction to non-breaking space on the wiki, and there are ways to output this character.
Https://en.wikipedia.org/wiki/Non-breaking_space

Want to replace the 00a0 character with a space

00A0 is non-breaking-space. 

I tried it. It seems that because of you, work is not normal

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