将关联对添加到PHP数组

Question

我有一个数组，我试着写

array_push($json['Request']['Header'], "key" => "val");

但我收到了一个错误。写下面的作品，但它添加了一个数组，而不仅仅是键/ val

array_push($json['Request']['Header'], array("key" => "val"));

..
[0] => Array
        (
            [key] => val
        )

//i would like
...
[key] => val

Answer 1

为什么不简单地写：

$json['Request']['Header'] = array();
$json['Request']['Header']['key'] = 'val';

Answer 2

尝试

$json['Request']['Header']['key'] = 'val';

Answer 3

使用加法运算符附加关联数组：

$json['Request']['Header'] += array("key" => "val");