Returns the character count of str
.
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.
If charset
parameter is omitted,
str
is assumed to be encoded in
iconv.internal_charset.
See also strlen() and mb_strlen().