Best way to import hierarchical taxonomy from data source?

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I am looking for some help with importing a hierarchical taxonomy into my site. I’ve created my own custom taxonomy and will be accessing the data source through a single API call. The returned data is a flat JSON response that has relationships built in based off their own ID’s from that data source.

Here is an example of the data:

{
“results”: [
{
“id”: 1,
“parent_id”: null,
“name”: “Technical”
},
{
“id”: 3,
“parent_id”: 1,
“name”: “Complete”
},
{
“id”: 4,
“parent_id”: 1,
“name”: “Expert”
},
{
“id”: 16,
“parent_id”: 1,
“name”: “Robots”
},
{
“id”: 17,
“parent_id”: 1,
“name”: “Camping”
}
] }

I started down the path of something like this:

foreach( $results as $result ) {
if ( !empty($result[‘parent_id’]) ) {
$term = wp_insert_term($result[‘name’], ‘custom_tax’);
//Custom ACF Field for the Term to capture API ID
update_field( ‘api_id’, $result[‘id’], $term[‘term_id’] );
}
}

Now, I am unsure of how I should possibly create a second loop to capture all of the `results` with a `parent_id` and how to set that parent id relationship with my taxonomy since it will have a different term id in my WordPress database.

What’s the best way for me to import the data from the API and create my own hierarchy in my taxonomy?

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