<?php function accountHash($accountNumber) { return array_sum( preg_split('//u', mb_substr($accountNumber, -6), null, PREG_SPLIT_NO_EMPTY) ); } var_dump(accountHash('9876543210')); var_dump(accountHash('321')); var_dump(accountHash('Hello, World!'));
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Value for `_results` contains invalid data `array`