我有下一个多维数组：
Array
(
[0] => Array
(
[id] => 1
[name] => Category 1
[parent] => 0
[children] => Array
(
[0] => Array
(
[id] => 3
[name] => Sub 1
[parent] => 1
[children] => Array
(
)
)
[1] => Array
(
[id] => 4
[name] => Sub 2
[parent] => 1
[children] => Array
(
[0] => Array
(
[id] => 6
[name] => Sub Sub 4
[parent] => 4
[children] => Array
(
)
)
)
)
)
)
[1] => Array
(
[id] => 2
[name] => Category 2
[parent] => 0
[children] => Array
(
[0] => Array
(
[id] => 5
[name] => Sub 3
[parent] => 2
[children] => Array
(
)
)
)
)
)
我需要用不同的缩进在页面上呈现这个数组。例如：
- 类别1
- Sub 1
- Sub 2
- Sub Sub 4
- 类别2
- Sub 3
我知道我可以使用SPL RecursiveArrayTerator，但我不知道怎么做。你能帮我吗，如何渲染这样的数组？
您只需编写一个函数并递归调用它就可以做到这一点，如下所示：
<?php
function list_items($data)
{
echo '<ul>';
foreach ($data as $cat)
{
echo '<li>'.$cat['name'];
if (count($cat['children']) > 0)
{
list_items($cat['children']);
}
echo '</li>';
}
echo '</ul>';
}
$array = array(
array(
'id' => 1,
'name' => 'Category 1',
'parent' => 0,
'children' => array(
array(
'id' => 3,
'name' => 'Category 3',
'parent' => 1,
'children' => array()
),
array(
'id' => 4,
'name' => 'Category 4',
'parent' => 1,
'children' => array(
array(
'id' => 5,
'name' => 'Category 5',
'parent' => 4,
'children' => array()
),
array(
'id' => 6,
'name' => 'Category 6',
'parent' => 4,
'children' => array()
)
)
)
)
),
array(
'id' => 2,
'name' => 'Category 2',
'parent' => 0,
'children' => array(
array(
'id' => 7,
'name' => 'Category 7',
'parent' => 2,
'children' => array()
)
)
)
);
list_items($array);
产品：
<ul>
<li>Category 1
<ul>
<li>Category 3</li>
<li>
Category 4
<ul>
<li>Category 5</li>
<li>Category 6</li>
</ul>
</li>
</ul>
</li>
<li>
Category 2
<ul>
<li>Category 7</li>
</ul>
</li>
</ul>
以下是如何实现RecursiveArrayTerator（基本上是直接从PHP.net复制的：http://www.php.net/manual/en/class.recursivearrayiterator.php#102574)。
老实说，我不确定ResursiveArrayTerator对@MattHumphrey的例子有多大帮助。
<?php
$array = [
[
'id' => 1,
'name' => 'Category 1',
'parent' => 0,
'children' => [
[
'id' => 3,
'name' => 'Category 3',
'parent' => 1,
'children' => []
],
[
'id' => 4,
'name' => 'Category 4',
'parent' => 1,
'children' => [
[
'id' => 5,
'name' => 'Category 5',
'parent' => 4,
'children' => []
],
[
'id' => 6,
'name' => 'Category 6',
'parent' => 4,
'children' => []
]
]
]
]
],
[
'id' => 2,
'name' => 'Category 2',
'parent' => 0,
'children' => [
[
'id' => 7,
'name' => 'Category 7',
'parent' => 2,
'children' => []
]
]
]
];
$iterator = new RecursiveArrayIterator($array);
echo "<ul>";
iterator_apply($iterator, 'traverseStructure', array($iterator));
echo "</ul>";
function traverseStructure($iterator) {
while ( $iterator -> valid() ) {
if ( $iterator -> hasChildren() ) {
echo "<li>Children: <ul>";
traverseStructure($iterator -> getChildren());
echo "</li></ul>";
}
else {
echo "<li>" . $iterator -> key() . ' : ' . $iterator -> current() . "</li>";
}
$iterator -> next();
}
}