扁平化多维数组连接键 [英] Flatten multidimensional array concatenating keys

问题描述

可能的重复:
PHP 在连接键时将嵌套数组转换为单个数组?
递归获取数组的键并创建下划线分隔的字符串

请在回答之前阅读整个问题.

Please, read the whole question before answering.

我有这个多维数组:

$data = array(
    'user' => array(
        'email'   => '[e-mail]',
        'name'    => 'Super User',
        'address' => array(
            'billing' => 'Street 1',
            'delivery' => 'Street 2'
        )
    ),
    'post' => 'Hello, World!'
);

我想让它变平，变成:

$data = array(
    'user.email' => '[e-mail]',
    'user.name'  => 'Super User',
    'user.address.billing'  => 'Street 1',
    'user.address.delivery' => 'Street 2',
    'post'       => 'Hello, World!'
);

重要:

• 钥匙对我来说非常很重要.我希望它们连接起来，用句点分隔.

• The keys are very important to me. I want them concatenated, separated by periods.

它应该适用于任何级别的嵌套.

It should work with any level of nesting.

谢谢！

推荐答案

感谢所有给出的答案.

我做了如下改造，是改进版.它不需要根前缀，不需要使用引用，读起来更干净，而且名字更好:

I have transformed it in the following, which is an improved version. It eliminates the need of a root prefix, does not need to use references, it is cleaner to read, and it has a better name:

function array_flat($array, $prefix = '')
{
    $result = array();

    foreach ($array as $key => $value)
    {
        $new_key = $prefix . (empty($prefix) ? '' : '.') . $key;

        if (is_array($value))
        {
            $result = array_merge($result, array_flat($value, $new_key));
        }
        else
        {
            $result[$new_key] = $value;
        }
    }

    return $result;
}

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