Replaces 'ill-formed' byte sequences with '?'.
See: https://github.com/php/php-src/pull/1099(PHP 7 >= 7.2.0, PHP 8)
mb_scrub — Replace ill-formed byte sequences with the substitute character
Perform a character set conversion from the specified encoding, or the default encoding if no encoding was specified, to the same encoding. This has the effect of replacing any invalid byte sequences with the substitute character.
stringThe input string.
encoding
      The encoding used to interpret string.
      If it is omitted or null, the
      mbstring.internal_encoding setting
      will be used if set, otherwise the default_charset setting
      will be used.
     
The string result with invalid byte sequences replaced.
| Версія | Опис | 
|---|---|
| 8.0.0 | encodingтепер може бутиnull. | 
Replaces 'ill-formed' byte sequences with '?'.
See: https://github.com/php/php-src/pull/1099