如何在多维数组中移动元素？

Question

我有一个数组，我需要修改它。 下面你可以看到我的数组中的每个元素都有多个元素，其中一些元素也是数组。

Array
(
    [ordered] => Array
        (
            [label] => Order ordered                    
            [next_states] => Array
                (
                    [deliver] => Array
                        (
                            [target] => delivered
                        )    
                )    
            [status] => complete
        )

[delivered] => Array
    (
        [label] => Order delivered                    
        [next_states] => Array
            (
                [check_invoice] => Array
                    (
                        [target] => invoice_correct
                    )    
            )    
        [status] => complete
    )

[invoice_paid] => Array
    (
        [label] => Invoice paid                    
        [next_states] => 
        [status] => disabled
    )    
)

我需要做的是从我的主数组中的每个元素中取出元素[next_states]并将其添加到下一个元素。 实际上，我只需要[next_states]的keys并将其添加到整个数组的下一个元素中的新键（ [next_step] ）。

例;

Array
(
    [ordered] => Array
        (
            [label] => Order ordered                    
            [next_states] => Array
                (
                    [deliver] => Array
                        (
                            [target] => delivered
                        )    
                )    
            [status] => complete
            [next_step] =>    //This first one can remain empty because it's the first one.
    )

[delivered] => Array
    (
        [label] => Order delivered                    
        [next_states] => Array
            (
                [check_invoice] => Array
                    (
                        [target] => invoice_correct
                    )    
            )    
        [status] => complete
        [next_step] => deliver  // <- HERE
    )

[invoice_paid] => Array
    (
        [label] => Invoice paid                    
        [next_states] => 
        [status] => disabled
        [next_step] => check_invoice  // <- HERE
    )    
)

我希望我的问题很清楚，有人会帮助我。 我已经有一个foreach循环，我将[status]添加到每个元素;

foreach ($steps as $key => $value) {
    $steps[$key]['next_step'] = prev($steps);
    if ($key === $nextStep) {
        $steps[$key]['status'] = 'active';
    } elseif (isset($uncompletedSteps[$key])) {
        $steps[$key]['status'] = 'disabled';
    } else {
        $steps[$key]['status'] = 'complete';
    }
}

我知道我必须在上面提到的foreach循环中添加一些内容，但我根本不知道如何做到这一点。 有人可以告诉我该怎么做？

Answer 1

使用array_keys创建用于在主数组中查找位置的数组：

$keys = array_keys($step);
// Test that array has more than one element
if (($klen = count($keys)) < 2 ) die("illegal lenth of the array");

for($i = 0; $i < $klen-1; $i++) 
    // Test that current element has next_states key
    // and it points to array
    if(isset($steps[$keys[$i]]['next_states']) && is_array($steps[$keys[$i]]['next_states']))
        // Put key in next element
        $steps[$keys[$i+1]]['next_step'] = key($steps[$keys[$i]]['next_states']);