Display categories and subcategories in wordpress

How to Display All Categories and Subcategories in WordPress

WordPress comes with the ability to sort your Content or Products into Categories, Tags
 and Taxonomies. One of the major difference between Categories and Tags is that 
Categories can have Subcategories or child categories. In this article, we will show you 
how to display Categories and Subcategories in WordPress.

Just paste the below code inside the WordPress

<?php
$args = array(
‘orderby’ => ‘name’,
‘parent’ => 0,
‘hide_empty’ => FALSE );

$categories = get_categories( $args );
$first = true;
foreach ($categories as $category) {

$theid = $category->term_id;
$my_table = $wpdb->prefix.”term_taxonomy”;
$children = $wpdb->get_results( “SELECT term_id FROM $my_table WHERE
 parent=$theid” );
$no_children = count($children);
// echo count($children);
if ($no_children >= 1) {
echo ‘<h2 id=”classRight”>’.$category->cat_name.'</h2>’;
// echo “<ul>”;
$args2 = array(
‘orderby’ => ‘name’,
‘parent’ => 2,
‘hide_empty’ => FALSE

// ‘taxonomy’ => $taxonomy
);
?>

<?php
$args2[“parent”]=$category->term_id;
$categories2 = get_categories( $args2 );
foreach ($categories2 as $category2) {
$catid = $category2->term_id;
// echo “subcatid “.$catid;   // To display category id

echo $category2->cat_name;

} }

}

Ouput :

Main-Category
Subcategory-01
Subcategory-02