具有相同键的数组合并不会被覆盖

Question

所以我有以下 2 个数组，键为 2016 和 2017

array(2) {
  [2016]=>
  array(11) {
    ["id"]=>
    string(1) "0"
    [0]=>
    string(1) "0"
    ["user_id"]=>
    string(1) "0"
    ["entry_id"]=>
    int(0)
    ["user_name"]=>
    string(0) ""
    [3]=>
    string(0) ""
    ["action"]=>
    string(11) "banner view"
    [4]=>
    string(11) "banner view"
    ["entry_details"]=>
    string(0) ""
    ["created"]=>
    string(4) "2016"
    ["total"]=>
    int(0)
  }
  [2017]=>
  array(11) {
    ["id"]=>
    string(1) "0"
    [0]=>
    string(1) "0"
    ["user_id"]=>
    string(1) "0"
    ["entry_id"]=>
    int(0)
    ["user_name"]=>
    string(0) ""
    [3]=>
    string(0) ""
    ["action"]=>
    string(11) "banner view"
    [4]=>
    string(11) "banner view"
    ["entry_details"]=>
    string(0) ""
    ["created"]=>
    string(4) "2017"
    ["total"]=>
    int(0)
  }
}
array(1) {
  [2017]=>
  array(30) {
    ["id"]=>
    string(2) "52"
    [0]=>
    string(2) "52"
    ["user_id"]=>
    NULL
    [1]=>
    NULL
    ["entry_id"]=>
    string(1) "2"
    [2]=>
    string(1) "2"
    ["user_name"]=>
    NULL
    [3]=>
    NULL
    ["action"]=>
    string(11) "banner view"
    [4]=>
    string(11) "banner view"
    ["entry_details"]=>
    string(4) "null"
    [5]=>
    string(4) "null"
    ["entry_type"]=>
    string(6) "banner"
    [6]=>
    string(6) "banner"
    ["created"]=>
    string(19) "2017-06-21 10:25:49"
    [7]=>
    string(19) "2017-06-21 10:25:49"
    ["ip"]=>
    string(9) "127.0.0.1"
    [8]=>
    string(9) "127.0.0.1"
    ["user_agent"]=>
    string(121) "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
    [9]=>
    string(121) "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
    ["browser"]=>
    string(13) "Google Chrome"
    [10]=>
    string(13) "Google Chrome"
    ["browser_version"]=>
    string(2) "58"
    [11]=>
    string(2) "58"
    ["os"]=>
    string(28) "Mac OSX 10 (Unknown Version)"
    [12]=>
    string(28) "Mac OSX 10 (Unknown Version)"
    ["total"]=>
    string(3) "510"
    [13]=>
    string(3) "510"
    ["date_only"]=>
    string(4) "2017"
    [14]=>
    string(4) "2017"
  }
}

现在，在数组合并之后，我应该得到一个包含 2 个数据键的数组，2016 和 2017 但我得到的是一个包含 3 个键的数组，它不会用相同的数据覆盖数组关键。

$final = array_merge($results,$results_from_db);

array(3) {
  [0]=>
  array(11) {
    ["id"]=>
    string(1) "0"
    [0]=>
    string(1) "0"
    ["user_id"]=>
    string(1) "0"
    ["entry_id"]=>
    int(0)
    ["user_name"]=>
    string(0) ""
    [3]=>
    string(0) ""
    ["action"]=>
    string(11) "banner view"
    [4]=>
    string(11) "banner view"
    ["entry_details"]=>
    string(0) ""
    ["created"]=>
    string(4) "2016"
    ["total"]=>
    int(0)
  }
  [1]=>
  array(11) {
    ["id"]=>
    string(1) "0"
    [0]=>
    string(1) "0"
    ["user_id"]=>
    string(1) "0"
    ["entry_id"]=>
    int(0)
    ["user_name"]=>
    string(0) ""
    [3]=>
    string(0) ""
    ["action"]=>
    string(11) "banner view"
    [4]=>
    string(11) "banner view"
    ["entry_details"]=>
    string(0) ""
    ["created"]=>
    string(4) "2017"
    ["total"]=>
    int(0)
  }
  [2]=>
  array(30) {
    ["id"]=>
    string(2) "52"
    [0]=>
    string(2) "52"
    ["user_id"]=>
    NULL
    [1]=>
    NULL
    ["entry_id"]=>
    string(1) "2"
    [2]=>
    string(1) "2"
    ["user_name"]=>
    NULL
    [3]=>
    NULL
    ["action"]=>
    string(11) "banner view"
    [4]=>
    string(11) "banner view"
    ["entry_details"]=>
    string(4) "null"
    [5]=>
    string(4) "null"
    ["entry_type"]=>
    string(6) "banner"
    [6]=>
    string(6) "banner"
    ["created"]=>
    string(19) "2017-06-21 10:25:49"
    [7]=>
    string(19) "2017-06-21 10:25:49"
    ["ip"]=>
    string(9) "127.0.0.1"
    [8]=>
    string(9) "127.0.0.1"
    ["user_agent"]=>
    string(121) "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
    [9]=>
    string(121) "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
    ["browser"]=>
    string(13) "Google Chrome"
    [10]=>
    string(13) "Google Chrome"
    ["browser_version"]=>
    string(2) "58"
    [11]=>
    string(2) "58"
    ["os"]=>
    string(28) "Mac OSX 10 (Unknown Version)"
    [12]=>
    string(28) "Mac OSX 10 (Unknown Version)"
    ["total"]=>
    string(3) "510"
    [13]=>
    string(3) "510"
    ["date_only"]=>
    string(4) "2017"
    [14]=>
    string(4) "2017"
  }
}

为什么会这样？正常吗？

Info: PHP 5.6.30 (cli) (built: Feb 7 2017 16:18:37) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

Answer 1

Values in the input array with numeric keys will be renumbered with incrementing keys starting from zero in the result array.

http://php.net/manual/en/function.array-merge.php

Answer 2

array_replace() 将用您的第二个子数组覆盖您的第一个 2017 子数组：

var_export(array_replace($a,$b));

+ 运算符，然后 ksort() 将做同样的事情：

$overwrite=$b+$a;
ksort($overwrite);
var_export($overwrite);

一个 demo link，您可以在其中使用两个数组变量上的函数。

array_merge() 和 array_merge_recursive() 将产生 3 个子数组。

即使您将键转换为字符串，如 '2017'，array_merge() 仍会将它们视为数字，您将得到 3 个子数组。

如果您尽可能地为每个键添加前缀 #，那么您就可以按预期使用 array_merge()。尝试在所有键上使用 #[year]，您将得到 2 个合并的子数组。（大家可以在上面的demo中自己测试link）

具有相同键的数组合并不会被覆盖

Array merge with same key's dont' overwrite

php

arrays

zend-framework