如何使用字符串从嵌套数组中获取值

问题描述：

我有一个像这样的数组：

I have an array like this:

$temp = array( '123' => array( '456' => array( '789' => '0' ) ),
               'abc' => array( 'def' => array( 'ghi' => 'jkl' ) )
             );

我有这样的字符串：

$address = '123_456_789';

我可以得到 $ temp ['123'] ['456 '] ['789'] 使用上面的数组 $ temp 和字符串 $ address ？

Can I get value of $temp['123']['456']['789'] using above array $temp and string $address?

有没有办法做到这一点，并且使用它是否是一种好习惯？

Is there any way to achieve this and is it good practice to use it?

答

这是一个简单的函数，它接受数组和字符串地址，其中的键由任何定义的定界符分隔。通过这种方法，我们可以使用for循环迭代到所需的数组深度，如下所示。

This is a simple function that accepts an array and a string address where the keys are separated by any defined delimiter. With this approach, we can use a for-loop to iterate to the desired depth of the array, as shown below.

<?php
function delimitArray($array, $address, $delimiter="_") {
    $address = explode($delimiter, $address);
    $num_args = count($address);

    $val = $array;
    for ( $i = 0; $i < $num_args; $i++ ) {
        // every iteration brings us closer to the truth
        $val = $val[$address[$i]];
        }
    return $val;
    }

$temp = array("123"=>array("456"=>array("789"=>"hello world")));
$address = "123_456_789";
echo delimitArray($temp,$address,"_");
?>

如何使用字符串从嵌套数组中获取值

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