(PHP 5, PHP 7)
iconv_strlen — Returns the character count of string
$str
   [, string $charset = ini_get("iconv.internal_encoding")
  ] )
   In contrast to strlen(),
   iconv_strlen() counts the occurrences of characters
   in the given byte sequence str on the basis of
   the specified character set, the result of which is not necessarily
   identical to the length of the string in byte.
  
strThe string.
charset
       If charset parameter is omitted,
       str is assumed to be encoded in
       iconv.internal_encoding.
      
   Returns the character count of str, as an integer.