PHP 陣列鍵值互換：與其他程式語言的效能對比

$array = ['a' => 1, 'b' => 2, 'c' => 3];

$flipped = array_flip($array);

array = {'a': 1, 'b': 2, 'c': 3}

flipped = {v: k for k, v in array.items()}

const array = {a: 1, b: 2, c: 3};

const flipped = Object.fromEntries(Object.entries(array).map(([k, v]) => [v, k]));

#include <unordered_map>

int main() {
  std::unordered_map<std::string, int> array = {{"a", 1}, {"b", 2}, {"c", 3}};

  std::unordered_map<int, std::string> flipped;
  for (auto const& [key, value] : array) {
    flipped[value] = key;
  }

  return 0;
}

{
  "name": "John Doe",
  "age": 30,
  "city": "New York"
}

$json = json_decode($jsonString, true);
$flipped = array_flip($json);

var_dump($flipped);

array(3) {
  ["John Doe"]=>
  string(3) "name"
  [30]=>
  string(3) "age"
  ["New York"]=>
  string(4) "city"
}