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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]; } $result = []; for($digit=0; $digit<10; $digit++) { if($sum-$digit>0) { $result[] = array_merge([$digit], getCombinedSum($digits-1, $sum-$digit)); } else { break; } } return $result; } var_dump(getCombinedSum(3, 4));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(4) { [0]=> array(5) { [0]=> int(0) [1]=> array(2) { [0]=> int(0) [1]=> int(4) } [2]=> array(2) { [0]=> int(1) [1]=> int(3) } [3]=> array(2) { [0]=> int(2) [1]=> int(2) } [4]=> array(2) { [0]=> int(3) [1]=> int(1) } } [1]=> array(4) { [0]=> int(1) [1]=> array(2) { [0]=> int(0) [1]=> int(3) } [2]=> array(2) { [0]=> int(1) [1]=> int(2) } [3]=> array(2) { [0]=> int(2) [1]=> int(1) } } [2]=> array(3) { [0]=> int(2) [1]=> array(2) { [0]=> int(0) [1]=> int(2) } [2]=> array(2) { [0]=> int(1) [1]=> int(1) } } [3]=> array(2) { [0]=> int(3) [1]=> array(2) { [0]=> int(0) [1]=> int(1) } } }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/UTYKv on line 15
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/UTYKv on line 15
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_NEW in /in/UTYKv on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_NEW in /in/UTYKv on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UTYKv on line 7
Process exited with code 255.

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