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| 1 | <?php |
| 2 | |
| 3 | namespace Lucent\Helpers\Maths; |
| 4 | |
| 5 | |
| 6 | class Set |
| 7 | { |
| 8 | |
| 9 | //Union returns an array containing both sets of values; |
| 10 | public static function union(array $a, array $b): array |
| 11 | { |
| 12 | return array_merge($a,$b); |
| 13 | } |
| 14 | |
| 15 | //The intersection returns elements that are in 'A' and 'B'. |
| 16 | public static function intersect(array $a, array $b, SetComparison $type = SetComparison::ValuesToValues): array |
| 17 | { |
| 18 | |
| 19 | //TODO add later |
| 20 | |
| 21 | return []; |
| 22 | } |
| 23 | |
| 24 | //The difference returns elements that are in 'A' but not 'B'. |
| 25 | public static function difference(array $a, array $b, SetComparison $type = SetComparison::ValuesToValues) : array |
| 26 | { |
| 27 | $output = []; |
| 28 | |
| 29 | switch ($type) { |
| 30 | |
| 31 | case SetComparison::KeysToKeys: |
| 32 | |
| 33 | foreach ($a as $key => $value) { |
| 34 | if (!array_key_exists($key, $b)) { |
| 35 | array_push($output, $key); |
| 36 | } |
| 37 | } |
| 38 | break; |
| 39 | |
| 40 | case SetComparison::ValuesToKeys: |
| 41 | |
| 42 | foreach ($a as $item) { |
| 43 | if (!array_key_exists($item, $b)) { |
| 44 | array_push($output, $item); |
| 45 | } |
| 46 | } |
| 47 | break; |
| 48 | |
| 49 | //Default comparison is value to value; |
| 50 | default: |
| 51 | foreach ($a as $item) { |
| 52 | if (!in_array($item, $b)) { |
| 53 | array_push($output, $item); |
| 54 | } |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | |
| 59 | return $output; |
| 60 | } |
| 61 | |
| 62 | } |