Return result of recursive function - php

Question

I got a recursive function which currently echo the results. I want this function to return results and loop them with foreach inside markup.
I understand that i should use some kind of iteration for each array to get my desired result but have failed with that. Currently my code look like this(with attempts to iterate):
public static function recursiveChildCategory($categories = array(), $depth = 0, $i = 0) {
$ca = [];
// Loop through categories
foreach($categories as $key => $category){
echo str_repeat(" ", $depth);
echo "<a href='".implode('/', $category['breadcrumb'])."'>{$category['title']}</a>";
echo '<br>';
$ca[$i] = [
'id' => $category['id'],
'title' => $category['title'],
];
if(isset($category['child'])) {
// Loop
self::recursiveChildCategory($category['child'], $depth + 1, $i++);
}
}
return $ca;
}
And incoming array to the function:
Array (
[0] => Array (
[id] => 7
[title] => Deserts
[slug] => deserts
[child] => Array (
[0] => Array (
[id] => 8
[title] => Space
[slug] => space
[child] => Array (
[0] => Array (
[id] =>
[title] =>
[slug] =>
[child] => Array ( )
)
)
)
)
)
)
Currently it just returns first level of child categories "Deserts", but nothing about "Space".
As desired result i want function to return all categories with $depth and infinite path to multiple child categoires (to do the same work as currently echo doing).
Thanks in advice

Answer 1

Try this and tell me if it's what you are looking for :
The array for my test :
$array = [
0 => [
"id" => 7,
"title" => "Deserts",
"slug" => "deserts",
"child" => [
0 => [
"id" => 8,
"title" => "Space",
"slug" => "space",
"child" => [
0 => [
"id" => 9,
"title" => "Test",
"slug" => "test"
]
]
]
]
]
];
The recursive function :
function recursiveChildCategory($categories, $depth = 0, $ca = []) {
// Loop through categories
foreach($categories as $key => $category){
$ca[$depth] = [
'id' => $category['id'],
'title' => $category['title'],
];
if(isset($category['child'])) {
// Loop
$ca = recursiveChildCategory($category['child'], $depth + 1, $ca);
} else {
break;
}
}
return $ca;
}
Now, how to use it :
$test = recursiveChildCategory($array);
var_dump($test);
And this is the output :
array(3) {
[0]=>
array(2) {
["id"]=>
int(7)
["title"]=>
string(7) "Deserts"
}
[1]=>
array(2) {
["id"]=>
int(8)
["title"]=>
string(5) "Space"
}
[2]=>
array(2) {
["id"]=>
int(9)
["title"]=>
string(4) "Test"
}
}
Here is a link to test it : http://sandbox.onlinephpfunctions.com/
EDIT : I made some modification because in OP example array can have multiple result in first "depth", here is the "new" solution :
The array for test :
$array = [
"0" =>
[ "id" => 3, "title" => "Subcat", "slug" => "subcat", "child" =>
[ "0" =>
[ "id" => 5, "title" => "Subsubcat2", "slug" => "subcat2", "child" =>
[ "0" =>
[ "id" => "", "title" => "", "slug" =>"", "breadcrumb" => [ "0" => "homeworld", "1" => "cat", "2" => "subcat", "3" => "subcat2" ], "child" => [ ] ]
]
]
]
],
"1" =>
[ "id" => 4, "title" => "Kalahari", "slug" => "kalahari", "child" =>
[ "0" => [ "id" => 7, "title" => "deserts", "slug" => "deserts", "child" =>
[ "0" =>
[ "id" => 8, "title" => "Ural", "slug" => "ural", "child" =>
[ "0" => [ "id" =>"", "title" =>"", "slug" =>"", "child" => [ ] ] ]
]
]
]
]
]
];
The function : I just add $ca[$depth][] instead of $ca[$depth]
function recursiveChildCategory($categories, $depth = 0, $ca = []) {
// Loop through categories
foreach($categories as $key => $category){
$ca[$depth][] = [
'id' => $category['id'],
'title' => $category['title'],
];
if(isset($category['child'])) {
// Loop
$ca = recursiveChildCategory($category['child'], $depth + 1, $ca);
} else {
break;
}
}
return $ca;
}
And now the result :
$test = recursiveChildCategory($array);
foreach ($test as $depth => $c) {
echo "depth : ".$depth."\n";
foreach ($c as $result) {
echo "Title : ".$result['title']."\n";
}
echo "=============\n";
}
The output is :
depth : 0
Title : Subcat
Title : Kalahari
=============
depth : 1
Title : Subsubcat2
Title : deserts
=============
depth : 2
Title :
Title : Ural
=============
depth : 3
Title :
=============
Test here : link