From these four arrays:
$root = (FORD, FIAT, GM, KIA, FERRARI);
$parentIsFiat = (Panda, Punto, Tipo);
$parentIsPanda = (1, 13, 16, 20);
$parentIs13 = (Red, Blue, White);
How can I create a multidimensional array to give me this:
FORD
FIAT
--Panda
----1
----13
------Red
------Blue
------White
----16
----20
--Punto
--Tipo
GM
KIA
FERRARI
Background: The current menu on my site has every link on the site in the HTML. I want to only have the HTML for menu items that are actually visible. At the moment I get each item in the path (FIAT > Panda > 13) and it's siblings with code similar to this:
$categoryPath = \XLite\Core\Database::getRepo('\XLite\Model\Category')->getCategoryPath($this->getCategoryId());
foreach ($categoryPath as $category) {
$currentCatID = $category->getID();
$currentCatSiblings = $category->getSiblings(true);
foreach ($currentCatSiblings as $sibling) {
$menuItems[$currentCatID][] = $sibling->getName(); // the four arrays above
}
}
Each of the arrays has the parent ID as the key so I can 'attach' it in the correct place but I don't know how to build the array from my four existing arrays.
You could introduce a temporary
$parent variable that will reference the place in the tree where the siblings must be inserted, and move that $parent reference further down the tree for the next "generation" of siblings:$tree = [];
$parent = &$tree; // Use `= &` to reference the same location
foreach ($categoryPath as $category) {
$currentCatID = $category->getID();
$currentCatSiblings = $category->getSiblings(true);
foreach ($currentCatSiblings as $sibling) {
$parent[] = [ "name" => $sibling->getName() ];
if ($sibling->getID() === $currentCatID) $index = count($parent) - 1;
}
$parent[$index]["children"] = [];
$parent = &$parent[$index]["children"]; // Use `= &` to reference the deeper location
}
At the end
$tree will contain the nested array. It will have "children" keys to store the nested structure, like this:[
[ "name" => "Ford" ],
[
"name" => "Fiat",
"children" => [
[
"name" => "Panda",
"children" => [
[ "name" => "1" ],
[
"name" => "13",
"children" => [
[ "name" => "Red" ],
[
"name" => "Blue",
"children" => [],
],
[ "name" => "White" ],
],
],
[ "name" => "16" ],
[ "name" => "20" ],
],
],
[ "name" => "Punto" ],
[ "name" => "Tipo" ],
],
],
[ "name" => "GM" ],
[ "name" => "Kia" ],
[ "name" => "Ferrari" ],
]
Or, if you prefer to have the names used as keys in an associative array, then:
$tree = [];
$parent = &$tree; // Use `= &` to reference the same location
foreach ($categoryPath as $category) {
$currentCatID = $category->getID();
$currentCatSiblings = $category->getSiblings(true);
foreach ($currentCatSiblings as $sibling) {
$parent[$sibling->getName()] = [];
}
$parent = &$parent[$category->getName()]; // Use `= &` to reference the deeper location
}
Result:
[
"Ford" => [],
"Fiat" => [
"Panda" => [
"1" => [],
"13" => [
"Red" => [],
"Blue" => [],
"White" => []
],
"16" => [],
"20" => []
],
"Punto" => [],
"Tipo" => []
],
"GM" => [],
"Kia" => [],
"Ferrari" => []
]
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