No PHP solutions yet? Here I come!
<?php function phoneFormat(array $numbers): string { if (10 !== count($numbers)) { throw new \RuntimeException("Wrong input"); } array_unshift($numbers, '(%d%d%d) %d%d%d-%d%d%d%d'); return call_user_func_array('sprintf', $numbers); } assert('(123) 456-7890' === phoneFormat([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]), "Function not functioning :-/");
But please edit the OP to explain what format do you want, not everybody comes from USA!
EDIT: added length validation
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No PHP solutions yet? Here I come!
But please edit the OP to explain what format do you want, not everybody comes from USA!
EDIT: added length validation