关联数组的关键名称

Question

我有一个嵌套的关联数组,如下所示:

$inputTypes= array( 
    "natural" => array(
        "text",
        "password",
        "textarea",
        "radio",
        "checkbox",
        "file"
    ),
    "hybrid" => array(
        "image",
        "date" ,
        "url",
        "email"
    )
);

我想打印其关键名称,应用如下所示的代码:

foreach ($inputTypes as $inputs){
    echo key($inputTypes).'<br>';
}

但我得到了这个输出

hybrid
hybrid

我怎样才能得到每个键的名字,谢谢.

Answer 1

foreach ($inputTypes as $key => $value){
    echo $key.'<br>';
}