PHP函数用路径获取递归路径键 [英] PHP function to get recursive path keys with path

问题描述

给定一个数组，我想要一个扁平版本的数组键.到那时，每个数组键都需要数组的路径"，并附加下划线.

一个例子最好地解释了这一点.

$arr = array("location"=>0,"details"=>array("width"=>0,"height"=>0,"level"=>array(三"=> 0)));函数答案($arr){....}

答案函数会返回这个:

array("location","details_width","details_height","details_level_three");

更新:

这是正在进行的工作.它将接受一个数组并返回数组键，但没有深度:

function recursive_keys($input){$output = array_keys($input);foreach($input as $sub){if(is_array($sub)){$output = array_merge($output, recursive_keys($sub));}}返回 $output;}

解决方案

function recursive_keys(array $array, array $path = array()) {$result = array();foreach ($array as $key => $val) {$currentPath = array_merge($path, array($key));如果(is_array($val)){$result = array_merge($result, recursive_keys($val, $currentPath));} 别的 {$result[] = join('_', $currentPath);}}返回 $result;}

此处演示:http://codepad.viper-7.com/WQ3UYI

Given an array, I would like a flattened version of the array keys. Each array key would need the 'path' of the array, to that point, appended with an underscore.

An example explains this best.

$arr = array("location"=>0,"details"=>array("width"=>0,"height"=>0,"level"=>array("three"=>0)));

function answer($arr) {....}

the answer function would return this:

array("location","details_width","details_height","details_level_three");

UPDATE:

Here is the work in progress. It will accept an array and return the array keys, but with no depth:

function recursive_keys($input)
{
    $output = array_keys($input);
    foreach($input as $sub){
        if(is_array($sub)){
            $output = array_merge($output, recursive_keys($sub));
        }
    }
    return $output;
}

解决方案

function recursive_keys(array $array, array $path = array()) {
    $result = array();
    foreach ($array as $key => $val) {
        $currentPath = array_merge($path, array($key));
        if (is_array($val)) {
            $result = array_merge($result, recursive_keys($val, $currentPath));
        } else {
            $result[] = join('_', $currentPath);
        }
    }
    return $result;
}

Demo here: http://codepad.viper-7.com/WQ3UYI

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