(PHP 5, PHP 7, PHP 8)
iconv_strlen — Returns the character count of string
$string, ?string $encoding = null): int|false
   In contrast to strlen(),
   iconv_strlen() counts the occurrences of characters
   in the given byte sequence string on the basis of
   the specified character set, the result of which is not necessarily
   identical to the length of the string in byte.
  
stringThe string.
encoding
       If encoding parameter is omitted or null,
       string is assumed to be encoded in
       iconv.internal_encoding.
      
   Returns the character count of string, as an integer,
   or false if an error occurs during the encoding.
  
| Version | Description | 
|---|---|
| 8.0.0 | encodingis nullable now. |