Show children of custom taxonomy terms - php

Question

I have the WP Jb manager plugin which I believe is just a custom post type for jobs. I have enabled categories created some categories.
I need to just show the children of each category instead of the whole list of categories.
I have the following code:
<?php
$terms = get_terms( 'job_listing_category', 'orderby=count&hide_empty=0' );
$count = count($terms);
if ( $count > 0 ){
echo "<ul>";
foreach ( $terms as $term ) {
echo "<li>" . $term->name . "</li>";
}
echo "</ul>";
}
?>
Which outputs a list of all categories (parent and children) as so:
Office
Warehouse
Manufacturing
Industrial
Construction
Building Services Engineers
The parent categories are the bold ones: Office, Industrial and Construction. I want to take one of them and display the children of that category only.
For example: get_category('industrial', 'children_of') (I know that's not the correct syntax), so it would result in showing the children only of the industrial category:
Warehouse
Manufacturing
I can't seem to find a way to do this - Could anyone help?

Answer 1

I managed to do this by using the following code:
<?php
$terms = get_terms( 'job_listing_category', 'parent=59' );
$count = count($terms);
if ( $count > 0 ){
echo "<ul>";
foreach ( $terms as $term ) {
echo "<li>" . $term->name . "</li>";
}
echo "</ul>";
}
?>

Answer 2

You can fetch the parent categories and then construct a list for each subcategory like so:
<?php
$taxonomies = get_terms(array(
'taxonomy' => 'job_listing_category',
'hide_empty' => false,
'parent' => 0,
));
if (!empty($taxonomies)):
foreach ($taxonomies as $parent) {
$output = '<ul>';
$children = get_terms(array(
'taxonomy' => 'job_listing_category',
'parent' => $parent->term_id,
'hide_empty' => false,
));
foreach ($children as $child) {
$output .= '<li>' . esc_html($child->name) . '</li>';
}
$output = '</ul>';
}
echo $output;
endif;
Note that the code wasnt tested. Find more info here: https://developer.wordpress.org/reference/functions/get_terms/