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<?php function getCombinedSum($digits, $sum) { if(!is_int($digits) || !is_int($sum) || $digits<1 || $sum<0) { throw new InvalidArgumentException('Invalid numeric format'); } if($sum>9*$digits) { throw new LogicException('Sum out of range'); } if($digits==1) { return [$sum]; } $result = []; $digit = 0; while($digit<10 && $sum>0) { $sum = $sum - $digit; $result[] = array_merge([$digit], getCombinedSum($digits-1, $sum-$digit)); $digit++; } return $result; } var_dump(getCombinedSum(3, 4));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught InvalidArgumentException: Invalid numeric format in /in/UWSDo:7 Stack trace: #0 /in/UWSDo(22): getCombinedSum(1, -1) #1 /in/UWSDo(22): getCombinedSum(2, 1) #2 /in/UWSDo(29): getCombinedSum(3, 4) #3 {main} thrown in /in/UWSDo on line 7
Process exited with code 255.

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