Question

如何使用array_walk替换嵌套数组中的值？

这是我的数组，

$item = array(
    "id" => "2",
    "title" => "parent 2",
    "children" => array (
           "id" => "4",
           "title" => "children 1"
        )
);

//replacement array:
$replace = [
  '2' => 'foo',
  '4' => 'bar',
  '7' => 'baz'
];

我的工作职能，

function myfunction(&$value,$key,$replace)
{   

    if(isset($replace[$key]))
    {
       $value = $replace[$key];
    }

    if(is_array($key))
    {
        array_walk($value,"myfunction",$replace);
    }
}

array_walk($item,"myfunction",$replace);

print_r($item);

结果，

Array
(
    [id] => 2
    [title] => parent 2
    [children] => Array
        (
            [id] => 4
            [title] => children 1
        )

)

我之后的结果，

Array
(
    [id] => 2
    [title] => foo
    [children] => Array
        (
            [id] => 4
            [title] => bar
        )

)

Answer 1

这个递归函数可以帮助你

function replace($item,$replace)
{
    foreach ($replace as $key => $value) 
    {
        if($item["id"]==$key)
            $item["title"] = $value;
        if(isset($item['children']))
            $item['children'] = replace($item['children'],$replace);
    }
    return $item;
}

它不修改$ item，它返回修改后的内容，所以你需要像这样调用它

$item = replace($item,$replace);

为了让你的函数修改参数$ item，只需通过引用传递它：

function replace(&$item,$replace)
{
    foreach ($replace as $key => $value) 
    {
        if($item["id"]==$key)
            $item["title"] = $value;
        if(isset($item['children']))
            replace($item['children'],$replace);
    }
}

在这种情况下，你只需要调用这样的函数：

replace($item,$replace);
print_r($item);

Answer 2

试试这个功能：

    function replaceKey($subject, $newKey, $oldKey) {

    if (!is_array($subject)) return $subject;

    $newArray = array(); // empty array to hold copy of subject
    foreach ($subject as $key => $value) {

        // replace the key with the new key only if it is the old key
        $key = ($key === $oldKey) ? $newKey : $key;

        // add the value with the recursive call
        $newArray[$key] = $this->replaceKey($value, $newKey, $oldKey);
    }
    return $newArray;
}

如何用array_walk替换嵌套数组中的值？

2 个答案: