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<?php function getCombinedSum($digits, $sum) { if(!is_int($digits) || !is_int($sum) || $digits<1 || $sum<0) { throw new InvalidArgumentException('Invalid numeric format'); } if(!is_int($base) || $base<2) { throw new LogicException('Invalid numeric base'); } if($sum>9*$digits) { throw new LogicException('Sum out of range'); } if($digits==1) { return [$sum]; } $result = []; for($digit=0; $digit<10 && $sum-$digit>0; $digit++) { foreach(getCombinedSum($digits-1, $sum-$digit) as $subsum) { $result[] = $digit.$subsum; $result[] = $subsum.$digit; } } return array_unique($result); } var_dump(getCombinedSum(3, 30));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $base in /in/nOB7m on line 9 Fatal error: Uncaught LogicException: Invalid numeric base in /in/nOB7m:11 Stack trace: #0 /in/nOB7m(34): getCombinedSum(3, 30) #1 {main} thrown in /in/nOB7m on line 11
Process exited with code 255.

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