Php 如何构造嵌套关联数组

我试图构造一个深度嵌套的关联数组，但我不知道构造一个数组的规则是什么。我有一个理论数组：

-one
-two
-three
-four
    -one
    -two
    -three
    -four
-five
-six
-seven
-eight
-nine
    -one
    -two            
    -three 
            -one
            -two
            -three
            -four
            -five
            -six

我尝试将其表示为php关联数组

$associative = array(
'one' => 'one-1',
'two' => 'two-2',
'three' => 'three-3',
'four' => 'four-4'
(
    'one' => 'one-four-1',
    'two' => 'two-four-2',
    'three' => 'three-four-3',
    'four' => 'four-four-4'
)
'five' => 'five-5',
'six' => 'six-6',
'seven' => 'seven-7',
'eight' => 'eight-8',
'nine' => 'nine-9'
(
    'one' => 'one-nine-1',
    'two' => 'two-nine-2',          
    'three' => 'three-nine-3' 
(   
        'one' => 'one-nine-three-1',
        'two' => 'two-nine-three-2',
        'three' => 'three-nine-three-3',
        'four' => 'four-nine-three-4',
        'five' => 'five-nine-three-5',
        'six' => 'six-nine-three-6'
))
);
$keys = array_values($associative);
echo $keys[0];

当我尝试执行php代码段时，我得到了这个错误

分析错误：语法错误，中出现意外的“（”，应为“）” 第7行的C:\wamp\www\array.php

所以我的问题是，编写这样一个数组的正确方法是什么？当我希望添加更多子元素时，应该遵循什么规则

---

注意：在我的理论数组中，四个有四个子，九个有三个子，三个有六个子。无论如何，我希望在我的虚拟数组中理解有子的想法。

子数组是顶级数组元素的实际值，您还必须使用以下命令启动它们：

---

请注意，我还添加了

，

s（在每次关闭

）

，因为正如我所说，数组是父数组元素的值。

子数组是顶级数组元素的实际值，您还必须使用以下命令启动它们：

$associative = array(
  'one' => 'one-1',
  'two' => 'two-2',
 'three' => 'three-3',
 'four' => array(
   'one' => 'one-four-1',
    'two' => 'two-four-2',
    'three' => 'three-four-3',
   'four' => 'four-four-4'
 ),
  'five' => 'five-5',
  'six' => 'six-6',
  'seven' => 'seven-7',
  'eight' => 'eight-8',
  'nine' => array(
    'one' => 'one-nine-1',
    'two' => 'two-nine-2',          
    'three' => array(
        'one' => 'one-nine-three-1',
        'two' => 'two-nine-three-2',
        'three' => 'three-nine-three-3',
        'four' => 'four-nine-three-4',
        'five' => 'five-nine-three-5',
        'six' => 'six-nine-three-6'
    )
  )
);
print_r($associative);

请注意，我还添加了

，

s（在每次关闭

）

，因为正如我所说，数组是父数组元素的值

$associative = array(
  'one' => 'one-1',
  'two' => 'two-2',
 'three' => 'three-3',
 'four' => array(
   'one' => 'one-four-1',
    'two' => 'two-four-2',
    'three' => 'three-four-3',
   'four' => 'four-four-4'
 ),
  'five' => 'five-5',
  'six' => 'six-6',
  'seven' => 'seven-7',
  'eight' => 'eight-8',
  'nine' => array(
    'one' => 'one-nine-1',
    'two' => 'two-nine-2',          
    'three' => array(
        'one' => 'one-nine-three-1',
        'two' => 'two-nine-three-2',
        'three' => 'three-nine-three-3',
        'four' => 'four-nine-three-4',
        'five' => 'five-nine-three-5',
        'six' => 'six-nine-three-6'
    )
  )
);
print_r($associative);