Question

我有一个我想要展平的数组，但我想添加一个反斜杠和所有父键。我有一个例子，有人可以帮帮我吗？该数组可以包含更多5个级别

Cars
    Mercedes
    BMW
    Chevrolet
        Caprice
        Other
Motors
    Yamaha
    Suzuki


Cars
Cars\Mercedes
Cars\BMW
Cars\Chevrolet
Cars\Chevrolet\Caprice
Cars\Chevrolet\Other
Motors
Motors\Yamaha
Motor\Suzuki

Answer 1

我已经快速演示了你所要求的内容，但不确定你的数组与我在这里测试的数据有多相似。如果您需要更多帮助，请告诉我，这是一个有趣的问题。

<?php
$arr = array(
    'val1' => 1,
    'val2' => 2,
    'val3' => array(
        'val3.1' => 1,
        'val3.2' => array(
            'val3.2.1' => 1
            ),
        'val3.3' => 3
        ),
    'val4' => 4
);

function arrayToPath($array, $path = ''){
    $paths_out = array(); 

    foreach($array as $key => $value){
        $path .= '\\' . $key;
        $paths_out[] = $path;
        if(true === is_array($value)){
            $paths_out = array_merge($paths_out, arrayToPath($value, $path));
        }
    }

    return $paths_out;
}

$path_outputs = arrayToPath($arr);
var_dump($path_outputs);
?>

将输出：

array(8) { 
    [0]=> string(5) "\val1" 
    [1]=> string(10) "\val1\val2" 
    [2]=> string(15) "\val1\val2\val3" 
    [3]=> string(22) "\val1\val2\val3\val3.1" 
    [4]=> string(29) "\val1\val2\val3\val3.1\val3.2" 
    [5]=> string(38) "\val1\val2\val3\val3.1\val3.2\val3.2.1" 
    [6]=> string(36) "\val1\val2\val3\val3.1\val3.2\val3.3" 
    [7]=> string(20) "\val1\val2\val3\val4" 
}

Answer 2

尝试使用这种简单的递归方法：

<?php

$catalog = [
    'Cars' => [
        'Mercedes' => [],
        'BMW' => [],
        'Chevrolet' => [
            'Caprice',
            'Other'
        ],
    ],
    'Motors' => [
        'Yamaha',
        'Suzuki'
    ]
];

function flattenCatalog($input, $location='') {
    $output = [];
    foreach ($input as $key=>$val) {
        if (is_array($val)) {
            $output[] = $location.'\\'.$key;
            foreach (flattenCatalog($val, $location.'\\'.$key) as $subval) {
                $output[] = $subval;
            }
        }
        else {
            $output[] = $location.'\\'.$val;
        }
    }
    return $output;
}

print_r(flattenCatalog($catalog));

输出显然是：

Array
(
    [0] => \Cars
    [1] => \Cars\Mercedes
    [2] => \Cars\BMW
    [3] => \Cars\Chevrolet
    [4] => \Cars\Chevrolet\Caprice
    [5] => \Cars\Chevrolet\Other
    [6] => \Motors
    [7] => \Motors\Yamaha
    [8] => \Motors\Suzuki
)

PHP使用前面的父键将数组渲染为平面数组

2 个答案: