Fatal error: idn_to_ascii(): ICU returned an unexpected length.

[dmitry-kulikov]

What steps will reproduce the problem?

Fatal error occurs if used PHP, IDN enabled and domain name length is exactly 255 characters in ASCII representation.

use kdn\yii2\validators\DomainValidator;

$validator = new DomainValidator(['enableIDN' => true]);
// 255 ASCII characters
$validator->validate(str_repeat('a.', 126) . 'aaa', $error);
echo $error;

Other way

use kdn\yii2\validators\DomainValidator;

$validator = new DomainValidator(['enableIDN' => true]);
// "ф" is cyrillic symbol, only 69 characters, but after conversion to ASCII will be 255
$validator->validate(str_repeat('ф.', 31) . 's.s.s.s', $error);
echo $error;

What is the expected result?

the input value is too long.

What do you get instead?

Fatal error: idn_to_ascii(): ICU returned an unexpected length.

Additional info

Q	A
Extension version	All
Yii version	All
PHP version	All
HHVM version	-
Operating system	All

Solution

There was bug in PHP function idn_to_ascii, it was fixed in PHP 5.6 and PHP 7, please upgrade PHP or consider switching to HHVM.