php - 比较两个多维数组然后创建唯一的数组

Question

我已经尝试了好几个小时了。

我有两个多维数组

    $newData (
    [0] => Array(
        [id] => 1
        [name] => John
        [sex] => male
    )
    [1] => Array(
        [id] => 2
        [name] => Kenny
        [sex] => male
    )
    [2] => Array(
        [id] => 3
        [name] => Sarah
        [sex] => female
    )
    [3] => Array(
        [id] => 4
        [name] => George
        [sex] => male
    )
)

$oldData (
    [0] => Array(
        [id] => 3
        [name] => Sarah
        [sex] => female
    )
    [1] => Array(
        [id] => 4
        [name] => George
        [sex] => male
    )
    [2] => Array(
        [id] => 5
        [name] => Peter
        [sex] => male
    )
    [3] => Array(
        [id] => 6
        [name] => Lexi
        [sex] => female
    )
)

我需要比较 $newData 和 $oldData 并只获取第一个公共(public)数组之前的新数据。

我的 $newData 将是:

$newData (
[0] => Array(
    [id] => 1
    [name] => John
    [sex] => male
)
[1] => Array(
    [id] => 2
    [name] => Kenny
    [sex] => male
)

)

如果比较 ID 键，我已经尝试了 array_unique 中的所有方法，但没有任何工作正常。

我需要先合并它们吗？映射他们？呸，我不知道，我迷路了。

任何帮助都会很棒

Answer 1

我只想做一个嵌套的 foreach 循环。我不知道您使用的是哪种编程语言，但假设它是 PHP ($):

$tmpArray = array();

foreach($newData as $data1) {

  $duplicate = false;
  foreach($oldData as $data2) {
    if($data1['id'] === $data2['id'] && $data1['name'] === $data2['name'] && $data1['sex'] === $data2['sex']) $duplicate = true;
  }

  if($duplicate === false) $tmpArray[] = $data1;
}

然后您在 $tmpArray 变量中有了所需的数组。您当然可以在之后制作 $newData = $tmpArray;。