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Hide hidden character from string

This is something that should be simple, but I cannot understand.

This site is encoded by UTF-8.

The client had problems filling out the form on our website. Here is an example of the data they entered.

SPICER-SMITHS LOST

It looks like a regular line, but when you copy this line to an application, such as notepad ++, you will see "?" appear in the word "SMITHS" ("SMITH? S").

The script deactivates the field and performs an additional step to delete the following characters: "\r\n", "\n", "\r", "\t", "\0", "\x0B" .

He did not catch this hidden character.

Does anyone know what is going on here?

EDIT: I am using php. Here is the function I use to disinfect the field:

 function strip_hidden_chars($str) { $chars = array("\r\n", "\n", "\r", "\t", "\0", "\x0B"); $str = str_replace($chars," ",$str); return preg_replace('/\s+/',' ',$str); }

EDIT 2: @thaJeztah led me to the answer. The line that I tested is the exit from our support ticket after the client has copied and pasted it from any application that it uses. Actual input was

SPICER-SMITHS

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2 answers

You can try to look here; delete control characters?

Remove control characters from php string

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it also works

 $chars = array("\r\n", '\\n', '\\r', "\n", "\r", "\t", "\0", "\x0B"); str_replace($chars,"<br>",$data);
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