I made it !
This is the final code that returns a hierarchical array based on taxonomy.
public function return_all_tax_objects() {
$obj_term_posts = array();
// GET FLAT LIST OF TERMS BELONGING TO THE POST
foreach ( $this->return_object_terms() as $obj_term ) {
// IF TERM HAS A PARENT
if ( $obj_term->parent ) {
unset ( $keys );
// GET ANCESTORS OF TERM AND REVERSE IT
// SO WE HAVE IT FROM ROOT
$ancestors = array_reverse( get_ancestors( $obj_term->term_id, $obj_term->taxonomy ) );
// WE GET ANCESTORS AND STORE SLUG IN ARRAY
foreach ( $ancestors as $ancestor ) {
$ancestor_term = get_term( $ancestor, $obj_term->taxonomy );
$keys[] = $ancestor_term->slug;
}
}
// LAST ITEM FOR KEYS IS CURRENT TERM SLUG
$keys[] = $obj_term->slug;
// DUPLICATE WITH INCLUSION
$temp =& $obj_term_posts;
// CREATE INDEX FROM KEYS ARRAY
foreach ( $keys as $key ) {
$temp =& $temp[ $key ];
}
// GET ASSOCIATED POSTS TO THAT TERM
$temp = $this->get_posts_for_term( $obj_term );
}
return $obj_term_posts;
}
Result :
