https://www.php.net/manual/it/uconverter.geterrormessage.php
PHP: UConverter::getErrorMessage - Manual
Get last error message on the object
phpmanual
https://www.php.net/manual/tr/transliterator.geterrormessage.php
PHP: Transliterator::getErrorMessage - Manual
Get last error message
phptransliteratormanual
https://www.php.net/manual/zh/collator.geterrormessage.php
PHP: Collator::getErrorMessage - Manual
Get text for collator's last error code
phpcollatormanual
https://www.php.net/manual/en/collator.geterrormessage.php
PHP: Collator::getErrorMessage - Manual
Get text for collator's last error code
phpcollatormanual