如何通过仅从与第一个数组具有相同键的第二个数组中接管值来合并两个数组?

However I'm wondering if there is any (native) function that can reduce the $changed array into an array with the $keys specified by array_intersect_key? I know I can use array_filter with a callback function and check against $keys therein, but there is probably some other purely native function to extract only those elements from an array of which the keys can be specified?

我这么问是因为原生函数通常比带有回调的 array_filter 快得多.

I'm asking because the native functions are often much faster than array_filter with a callback.

推荐答案

如果我正确理解你的逻辑，应该这样做:

This should do it, if I'm understanding your logic correctly:

array_intersect_key($changed, $filtered) + $filtered

<小时>

实施:

$filtered = array(1 => 'a', 3 => 'c');
$changed = array(2 => 'b*', 3 => 'c*');
$expected = array(1 => 'a', 3 => 'c*');    
$actual = array_key_merge_deceze($filtered, $changed);

var_dump($expected, $actual);

function array_key_merge_deceze($filtered, $changed) {
    $merged = array_intersect_key($changed, $filtered) + $filtered;
    ksort($merged);
    return $merged;
}

输出:

Expected:
array(2) {
  [1]=>
  string(1) "a"
  [3]=>
  string(2) "c*"
}

Actual:
array(2) {
  [1]=>
  string(1) "a"
  [3]=>
  string(2) "c*"
}

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