How to make automatic insertion of categories in doctrine tree from xml?

Question

symfony

Hello!
There is an xml, a file for unloading goods from 1c, categories of goods are specified in the form level0=name, level1=name and so on.
Structure of a DB

Now I write a parser for entering in a database. Created doctrine entities. With all entities it is clear, except for categories.
Here's how it works with an example in the tree documentation

/** Inserting node in different positions **/

<?php
$food = new Category();
$food->setTitle('Food');

$fruits = new Category();
$fruits->setTitle('Fruits');

$vegetables = new Category();
$vegetables->setTitle('Vegetables');

$carrots = new Category();
$carrots->setTitle('Carrots');

$treeRepository
    ->persistAsFirstChild($food)
    ->persistAsFirstChildOf($fruits, $food)
    ->persistAsLastChildOf($vegetables, $food)
    ->persistAsNextSiblingOf($carrots, $fruits);

$em->flush();

/**
Tree example:

/Food
    /Vegetables
        /Onions
        /Carrots
        /Cabbages
        /Potatoes
    /Fruits
**/

https://github.com/Atlantic18/DoctrineExtensions/b...
But the bottom line is that I do not need to enter each category manually, they are already written in xml with nesting and title.
I do not understand what algorithm should be written

Answer 1

Recursively iterate through the category xml, simply specifying the parent for each category.
Here is the section in the documentation