PHP code conversion minus sign (connector) cannot be converted

PHP code conversion minus signs (connectors) cannot be converted. PHP code conversion minus signs (connectors) cannot be converted.

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Use PHP's iconv or mb_convert_encoding function for encoding conversion. for example, to convert gb2312 to UTF-8 encoding, some special characters (minus signs, connectors) may not work properly, it may become a question mark "? "Or" C ". I tried multiple methods and still cannot solve this problem well. The following code indicates that the connection symbol "-" still becomes a symbol "after the // IGNORE is declared "? ".

   
According to the solution provided by netizens in the PHP Official Manual, the problem still cannot be solved. I don't know if it is my local PHP version.
  
Solution 1:
Please note that iconv ('utf-8', 'ascii // Transcoder ',...) doesn't work properly when locale category LC_CTYPE is set to C or POSIX. you must choose another locale otherwise all non-ASCII characters will be replaced with question marks. it is at least true with glibc 2.5.
Example:
[Translation]
Note that iconv cannot work normally when the language environment class LC_CTYPE is set to C or POSIX. You must select another language. otherwise, all non-ASCLL codes will be replaced with question marks "? ". This problem is true under glibc 2.5.
Example:
  
    
Solution 2:
That will strip invalid characters from UTF-8 strings (so that you can insert it into a database, etc .). instead of "none" you can also use the value 32 if you want it to insert spaces in place of the invalid characters.
  
     
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