通过字符串数组访问嵌套的关联数组 [英] Access nested associative array by array of strings

问题描述

所以基本上我想转换类似的代码

So basically i would like to transform code like

$my_array = [];   
$cur_string = ['a', 'b', 'c', 'd'];
$v = 'Hello world!';

类似:

$my_array['a']['b']['c']['d'] = $v;

我尝试过类似的事情:

foreach( $cur_string as $cur ) {
    if ( !isset( $current[ $cur ] ) ) {
        $current[ $cur ] = [];
    }

    $current = $current[ $cur ];
}

$current[$k] = $v;

但是我知道该代码不起作用.如何执行此操作?我不知道$ cur_string数组中嵌套的确切级别.

But I know this code isn't supposed to work.. How can I do this? I don't know exact level of nesting in $cur_string array.

推荐答案

您可以使用以下基于引用传递的方法.

You can use the following method which is based on passing by reference.

/**
 * Fill array element with provided value by given path
 * @param array $data Initial array
 * @param array $path Keys array which transforms to path
 * For example, [1, 2, 3] transforms to [1][2][3]
 * @param mixed $value Saved value
 */
function saveByPath(&$data, $path, $value)
{
    $temp = &$data;

    foreach ($path as $key) {
        $temp = &$temp[$key];        
    }

    // Modify only if there is no value by given path in initial array
    if (!$temp) {
        $temp = $value;
    }

    unset($temp);
}

用法:

没有初始值:

$a = [];

saveByPath($a, [1, 2, 3, 4], 'value');

var_dump($a[1][2][3][4]) -> 'value';

具有初始值:

$a = [];
$a[1][2][3][4] = 'initialValue';

saveByPath($a, [1, 2, 3, 4], 'value');

var_dump($a[1][2][3][4]) -> 'initialValue';

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