make a nameless array out 2 diferent tables with children in php - php

Question

I have 2 tables in my DB. 1 is full with numbers (foreign keys) and other one is full of the data I need. This is how the array should (exactly) look
"array" : [
{
"data" : "blabla"
"data2" : "blabla"
"children" : [
{
"data" : "blabla"
"data2" : "blabla"
"children" : [
{
"data" : "blabla"
"data2" : "blabla"
}
]
},
{
"data" : "blabla"
"data2" : "blabla"
"children" : [
{
"data" : "blabla"
"data2" : "blabla"
}
]
}
]
}
]
and so on, so to say.. now the right order you can find in table 1,where it is lited what the mother ID is. and i need to get the data out of table 2 so be in the array. anyone knows how to do this? i am working in codeigniter
updated with pics:

Answer 1

To do that, you would need to process in two steps:
You fetch each document and it's data from the two tables (let's call them "documents" and "documents_data" to build a flat array of all the documents. This way you don't have to wonder where does the data go anymore :
$results = $this->db->query("SELECT d.*, dd.* FROM documents d LEFT JOIN documents_data dd ON dd.doc_id = d.doc_id");
$documents = $results->result_array();
Now that we have everything about each document, we just need to reorder them in a recursive array using a recursive function, that will call itself with the parent id for each children and build the tree :
function getDocumentTree($documents, $idParent = null)
{
$tree = [];
foreach($documents as $document) {
if($document['doc_doc_id'] == $idParent) {
$document['children'] = getDocumentTree($documents, $document['doc_id']);
$tree[] = $document;
}
}
return $tree;
}
$tree = getDocumentTree($documents);
Note: I haven't tested this code, this is just an idea on how it works, try to understand that (especially the concept of recursivity) and implement it by yourself.