遍历多个数组并执行函数 [英] Iterate through multiple array and execute function

问题描述

我有一个具有以下结构的数组：

I have an array with the following structure:

Array
(
    [0] => Array
        (
            [animal] => dog
            [color] => black
        )

    [1] => Array
        (
            [animal] => cat
            [color] => white
        )

    [2] => Array
        (
            [animal] => mouse
            [color] => grey
            [attributes] => Array
                (
                    [nickname] => snuggles
                    [nickname] => buddy
                )

        )

)

我现在需要对属性数组中的每个值执行一个函数。因此，例如将 SNUGGLES 和 BUDDY 大写。

I now need to execute a function on every value in the attribute array. So for example capitalize SNUGGLES and BUDDY.

此是我的方法：

$array = array(
    array("animal"=>"dog","color"=>"black"),
     array("animal"=>"cat","color"=>"white"),
     array("animal"=>"mouse","color"=>"grey", "attributes" => array("nicknames" => "snuggles", "nicknames" => "buddy"))
);

foreach ( $array as $key => $value ) {
    foreach ( $value as $key1 => $value1 ) {
        if ($key1 == 'attributes') {
            foreach ( $value as $key2 => $value2 ) {
                $value2 =  strtoupper($value2);
                $array [$key] [$key1] [$key2]= $key2;
            }
        }
    }
}

但是我收到此错误：

strtoupper（）期望参数1为字符串，并在...

strtoupper() expects parameter 1 to be string, array given in ...

推荐答案

您在内部循环中使用了错误的变量：

You are using the wrong variable in your inner loop:

foreach ( $value as $key2 => $value2 ) {
          ^^^^^^ here
    ...
}

根据代码判断，您想使用 $ value1 那里：

Judging by the code, you would want to use $value1 there:

foreach ( $value1 as $key2 => $value2 ) {
          ^^^^^^^ here
    ...
}

假设下拉列表 => 属性 ...

Assuming that dropdown => attributes...

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