[英]Recursive Nested Navigation with PHP
I know this is asked a lot, but I can't get it to work correctly. 我知道这个问题很多,但我无法使其正常工作。
What I have A PHP function that get's the page id (fk_page). 我所拥有的PHP函数可以获取页面ID(fk_page)。 Inside this function the same function is called to look for child pages.
在此函数内部,调用了相同的函数来查找子页面。
My Database looks like this: 我的数据库如下所示:
The PHP Code looks like this: PHP代码如下所示:
private function createNav($parent = 0, $sub = false) {
// *!* Create Nav
$getNavPage = $this->model->loadNav($parent); // array of menu items (fk_page) that have $parent as parent.
$NavPage = 0;
foreach ($getNavPage as $getPage) {
$NavPage = intval($getPage["fk_page"]);
$subnav = $this->createNav($NavPage, true); // get childs (recursive loop) and save fk_page in $subnav
if($sub === false) $this->navArr[$parent][] = $NavPage;
else $this->navArr[$parent][][] = $NavPage;
}
return $NavPage;
}
The model does the following 该模型执行以下操作
public function loadNav($parent) {
$stmt = $this->pdo->prepare("SELECT fk_page FROM nav WHERE fk_parentpage = " . $parent . ";");
$stmt->execute();
return $stmt->fetchAll();
}
Now the result is an array that looks like this 现在的结果是一个看起来像这样的数组
array(3) {
[0]=>
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
[2]=>
array(1) {
[0]=>
array(1) {
[0]=>
int(4)
}
}
[3]=>
array(2) {
[0]=>
array(1) {
[0]=>
int(5)
}
[1]=>
array(1) {
[0]=>
int(6)
}
}
}
What I would like to have as a result: 结果,我希望拥有什么:
array(3) {
[0]=>
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
array(1) {
[0]=>
array(1) {
[0]=>
int(4)
}
}
[3]=>
array(2) {
[0]=>
array(1) {
[0]=>
int(5)
}
[1]=>
array(1) {
[0]=>
int(6)
}
}
}
}
I believe that the createNav() must run before the array element is written (or even inside the array $this->NavArr), but I wasn't really succesfull. 我相信createNav()必须在写入数组元素之前运行(甚至在$ this-> NavArr数组内部),但是我并没有真正成功。
Here is an example that uses local data but mimics what you're trying to do: 这是一个使用本地数据但模仿您要执行的操作的示例:
$data_array = array(
0 => array(1, 2, 3)
, 2 => array(4)
, 3 => array(5, 6)
);
function get_kids($id = 0) {
global $data_array;
if(isset($data_array[$id])) {
return $data_array[$id];
}
else {
return array();
}
}
function create_navigation($parent_id = 0) {
// Check for children
$children_array = get_kids($parent_id);
// No children - just return the parent
if (empty($children_array)) {
return $parent_id;
}
// Children!
foreach ($children_array as $key => $child_id) {
$children_array[$key] = create_navigation($child_id);
}
return array($parent_id => $children_array);
}
echo '<pre>';
$nav = create_navigation(0);
var_dump($nav);
print_r($nav);
echo '</pre>';
The $data_array
is used instead of your database. 使用
$data_array
代替您的数据库。
The get_kids
function is your loadNav
method. get_kids
函数是您的loadNav
方法。
The create_navigation
function is your createNav
method. create_navigation
函数是您的createNav
方法。
This produces a var_dump
: 这将产生一个
var_dump
:
array(1) {
[0]=>
array(3) {
[0]=>
int(1)
[1]=>
array(1) {
[2]=>
array(1) {
[0]=>
int(4)
}
}
[2]=>
array(1) {
[3]=>
array(2) {
[0]=>
int(5)
[1]=>
int(6)
}
}
}
}
And a print_r
: 还有一个
print_r
:
Array
(
[0] => Array
(
[0] => 1
[1] => Array
(
[2] => Array
(
[0] => 4
)
)
[2] => Array
(
[3] => Array
(
[0] => 5
[1] => 6
)
)
)
)
The problem with your original code is you were assigning IDs to the class variable $this->navArr
instead of using recursion to return the child elements ( $subnav
). 原始代码的问题是,您正在向类变量
$this->navArr
分配ID,而不是使用递归返回子元素( $subnav
)。
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