数组循环-无法获取要打印的键

Question

$newarray 中有一个数组，如下所示

Array
(
    [111] => Array
        (
            [123] => 0
            [124] => 0
            [125] => 0
            [126] => 0
            [127] => 0
            [128] => 0
            [129] => 0
            [130] => 1
            [131] => 1
            [132] => 1
            [133] => 1
            [134] => 1
            [135] => 1
        )
    [222] => Array
        (
            [123] => 0
            [124] => 0
            [125] => 0
            [126] => 1
            [127] => 1
            [128] => 1
            [129] => 1
            [130] => 1
            [131] => 1
            [132] => 1
            [133] => 1
            [134] => 1
            [135] => 1
        )
    [333] => Array
        (
            [256] => 0
            [321] => 0
            [456] => 0
            [489] => 0
            [652] => 1
            [741] => 1
            [965] => 0
        )
)

我需要在foreach中获取密钥名称（在本例中为111222和333）：

不管我做什么，下面的人总是吐出"222"3次。有什么明显的吗？

foreach($newarray as $value) {
echo key($newarray) . "<br />";
}

输出

222
222
222

Answer 1

试试这个：

foreach($newarray as $key => $value)
{
     echo $key . "<br />";
}

Answer 2

这是使用foreach 的正确方法

foreach($newarray as $key=>$value) {
    echo $key . "<br />";
}

或者你可以使用

print_r(array_keys($newarray));