一般PHP中合并两个数组都会使用array_merge()

$data1 = ['111' => 'aaa', '222' => 'bbb', '333' => 'ccc'];
$data2 = ['444' => 'ddd', '555' => 'eee', '666' => 'fff'];
$data = array_merge($data1, $data2);

得到结果

array(6) {
  [0]=>
  string(3) "aaa"
  [1]=>
  string(3) "bbb"
  [2]=>
  string(3) "ccc"
  [3]=>
  string(3) "ddd"
  [4]=>
  string(3) "eee"
  [5]=>
  string(3) "fff"
}

可以看到使用array_merge()会重置key值，如果key值对我们有用，不想重置，可以使用"+"合并数组。

$data1 = ['111' => 'aaa', '222' => 'bbb', '333' => 'ccc'];
$data2 = ['444' => 'ddd', '555' => 'eee', '666' => 'fff'];
$data = $data1 + $data2;
var_dump($data);

得到结果

array(6) {
  [111]=>
  string(3) "aaa"
  [222]=>
  string(3) "bbb"
  [333]=>
  string(3) "ccc"
  [444]=>
  string(3) "ddd"
  [555]=>
  string(3) "eee"
  [666]=>
  string(3) "fff"
}