Sadly I struggle with anything where recursion is involved and this problem is no different.
I have a category structure in a PHP array. I have grouped it by parent categories like this, but if a solution warrants it, I would be happy to change that:
array(5) {
[0] => array(4) {
[50] => array(5) {
["category_id"] => int(50)
["category_title"] => string(29) "Category 50"
["parent_category_id"] => int(0)
["display_order"] => int(0)
["depth"] => int(0)
}
[1] => array(5) {
["category_id"] => int(1)
["category_title"] => string(24) "Category 1"
["parent_category_id"] => int(0)
["display_order"] => int(1)
["depth"] => int(0)
}
[80] => array(5) {
["category_id"] => int(80)
["category_title"] => string(27) "Category 80"
["parent_category_id"] => int(0)
["display_order"] => int(1)
["depth"] => int(0)
}
[10] => array(5) {
["category_id"] => int(10)
["category_title"] => string(29) "Category 10"
["parent_category_id"] => int(0)
["display_order"] => int(10)
["depth"] => int(0)
}
}
[1] => array(1) {
[2] => array(5) {
["category_id"] => int(2)
["category_title"] => string(21) "Category 2"
["parent_category_id"] => int(1)
["display_order"] => int(1)
["depth"] => int(1)
}
}
[30] => array(1) {
[90] => array(5) {
["category_id"] => int(90)
["category_title"] => string(11) "Category 90"
["parent_category_id"] => int(30)
["display_order"] => int(1)
["depth"] => int(2)
}
}
[10] => array(2) {
[20] => array(5) {
["category_id"] => int(20)
["category_title"] => string(21) "Category 20"
["parent_category_id"] => int(10)
["display_order"] => int(10)
["depth"] => int(1)
}
[30] => array(5) {
["category_id"] => int(30)
["category_title"] => string(17) "Category 30"
["parent_category_id"] => int(10)
["display_order"] => int(20)
["depth"] => int(1)
}
}
[50] => array(3) {
[40] => array(5) {
["category_id"] => int(40)
["category_title"] => string(6) "Category 40"
["parent_category_id"] => int(50)
["display_order"] => int(1000)
["depth"] => int(1)
}
[60] => array(5) {
["category_id"] => int(60)
["category_title"] => string(6) "Category 60"
["parent_category_id"] => int(50)
["display_order"] => int(2000)
["depth"] => int(1)
}
[70] => array(5) {
["category_id"] => int(70)
["category_title"] => string(17) "Category 70"
["parent_category_id"] => int(50)
["display_order"] => int(3000)
["depth"] => int(1)
}
}
So the end result of the HTML ought to look like this:
<ul>
<li>Category 50</li>
<ul>
<li>Category 40</li>
<li>Category 60</li>
<li>Category 70</li>
</ul>
<li>Category 1</li>
<ul>
<li>Category 2</li>
</ul>
<li>Category 80</li>
<li>Category 10</li>
<ul>
<li>Category 20</li>
<li>Category 30</li>
<ul>
<li>Category 90</li>
</ul>
</ul>
</ul>
Note that there could be multiple levels of nesting.
Although not depicted in the above example, it would be useful to be able to use more than just 'category_title' for each list item (there are some other parameters not shown, e.g. counts and other stats that have been removed for simplicity).
I am incredibly appreciative that you have even read this far. Any suggestions gratefully received.
Visual representation of the end result HTML:
I am looking to convert this into a HTML list like this:
- Category 50
- Category 40
- Category 60
- Category 70
- Category 1
- Category 2
- Category 80
- Category 10
- Category 20
- Category 30
- Category 90