Question

可能重复：
Convert multidimensional array into single array

我有这个数组：

Array
(
    [one] => one_value
    [two] => Array
        (
            [four] => four_value
            [five] => five_value
        )

    [three] => Array
        (
            [six] => Array
                (
                    [seven] => seven_value
                )

        )

)

我想将它转换为这种类型的数组：

Array
(
    [one] => one_value
    [two-four] => four_value
    [two-five] => five_value
    [three-six-seven] => seven_value
)

我怎样才能做到这一点？有某种“递归”吗？但是怎么样？：\ 提前谢谢！

Answer 1

<?php
$array = array(
    'one' => 'one_value',
    'two' => array
        (
            'four' => 'four_value',
            'five' => 'five_value'
        ),

    'three' => array
        (
            'six' => array
                (
                    'seven' => 'seven_value'
                )

        )
);

function flatten($array, $prefix = '') {
    $arr = array();
    foreach($array as $k => $v) {
        if(is_array($v)) {
            $arr = array_merge($arr, flatten($v, $prefix . $k . '-'));
        }
        else{
            $arr[$prefix . $k] = $v;
        }
    }
    return $arr;
}

var_dump(flatten($array));

//output:
//array(4) {
//  ["one"]=>
//  string(9) "one_value"
//  ["two-four"]=>
//  string(10) "four_value"
//  ["two-five"]=>
//  string(10) "five_value"
//  ["three-six-seven"]=>
//  string(11) "seven_value"
//}

Running example

Answer 2

您可以使用堆栈实现递归处理：

$separator = '-';
$flat = array();

while ($array);
{
    $key   = key($array);
    $value = array_shift($array);

    if (is_array($value))
    {
        foreach($value as $subKey => $node)
        {
            $array[$key.$separator.$subKey] = $node;
        }
    }
    else
    {
        $flat[$key] = $value;
    }
}

输出（Demo）：

Array
(
    [one] => one_value
    [two-four] => four_value
    [two-five] => five_value
    [three-six-seven] => seven_value
)

Php多维数组到简单数组

2 个答案: