<?php $value = str_repeat('ф.', 31) . 's.s.s.s'; // "ф" is cyrillic symbol, only 38 characters, but after conversion to ASCII will be much more $result = idn_to_ascii($value, 0, INTL_IDNA_VARIANT_UTS46, $idnaInfo); var_dump($result); var_dump($idnaInfo); // $idnaInfo['errors'] should be equal to 4, it is value of IDNA_ERROR_DOMAIN_NAME_TOO_LONG
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