如何用相应的$_POST值填充预先存在的多维数组

Question

如果不从第二个数组创建新值，我找不到array_replace_recursive所做的函数。

基本上我有这个数组的空值用于构造目的。然后我想从$_POST复制具有相同键的数据。但是我不希望外键的值被复制。

$array = array(
  'one' => '',
  'two' => array(
    'this' => '',
    'that' => '',
  ),
  // ...
);
$_POST = array(
  'one' => 'a',
  'two' => array(
    'this' => 'b',
    'that' => 'c',
    'dontcopyme' => '...',
  ),
  'dontcopyme' => 'x',
  // ...
);
//$new_array = array_merge_recursive($array, $_POST);
//$new_array = array_replace_reursive($array, $_POST);
$new_array = array_dosomemagic($array, $_POST);

在这个示例中我要的结果:

array(
  'one' => 'a'
  'two' => array(
    'this' => 'b'
    'that' => 'c'
  )
)
print_r($new_array);

注意:多维数组

Answer 1

对不起，这不是一个漂亮的一行代码，但是递归很难塞进一行。

我的方法包括一些重要的isset()检查，以确保数组元素在尝试访问它们之前存在。你不应该在我的函数中看到任何警告/通知。

代码(演示):

function recursivePopulate($defaults,$post){
    foreach($defaults as $key=>&$elem){  // make $elem modifiable by reference
        if(!is_array($elem) && isset($post[$key])){  // if not an array and matching element in $_POST
            $elem=$post[$key];  // store $post 
        }elseif(isset($post[$key])){  // only recurse subarray if exists in BOTH arrays
            $elem=recursivePopulate($elem,$post[$key]); // recurse using subarray
        }
    }
    return $defaults;
}
$defaults=[
    'one'=>'one',
    'two'=>[
        'this'=>'this',
        'that'=>'that',
            ['deep'=>'no match']
    ]
];
$_POST=[
  'one'=>'New One',
  'two'=>[
    'this'=>'New This',
    'that'=>'New That',
    'dontcopyme'=>'...'
  ],
  'dontcopyme' => 'X'
];
var_export(recursivePopulate($defaults,$_POST));

输出:

array (
  'one' => 'New One',
  'two' => 
  array (
    'this' => 'New This',
    'that' => 'New That',
    0 => 
    array (
      'deep' => 'no match',
    ),
  ),
)

Answer 2

您可能需要array_intersect_key()

<?php
$array1 = array('blue'  => 1, 'red'  => 2, 'green'  => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'   => 8);
var_dump(array_intersect_key($array1, $array2));
array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}
?>