Length validation does not adhere multibyte chars

[jaytaph]

It seems that detecting lengths on strings will use the strlen() function. This causes issues when detecting multibyte strings, as strlen() count bytes, not characters.

Example:

$v->required('user.first_name')->lengthBetween(2, 5)->alpha();
$result = $v->validate([
    'user' => [
        'first_name' => 'Björk',
    ],
]);

will thrown an error on validation, indicating that the length is too long (although bytewise correct, it's doubtful that this would be the expected behaviour)

[MMF]

fixed here

#106

[rick-nu]

Above PR didn't come through, this is still an open issue.

[sergio-ropero]

Any news about this issue?

In the PHP documentation it states that strlen returns the length in bites.

The correct way to count characters (counting multibyte characters as one) should be mb_strlen as the documentation mentions.

Thanks a lot!

[sergio-ropero]

@rick-nu Should we reopen and merge PR #161 so we can resolve the issue?

At the end, in newer versions of PHP they mention the difference between both strlen and mb_strlen and the behaviour is not going to change.
Thanks