Online PHP editor | refs for vDrjo

<?php class A1 { public function rows() { $a = array(); $a[] = array('parent_id' => 0, 'category_id' => 7, 'name' => 'id7'); $a[] = array('parent_id' => 0, 'category_id' => 8, 'name' => 'id8'); $a[] = array('parent_id' => 0, 'category_id' => 9, 'name' => 'id9'); $a[] = array('parent_id' => 7, 'category_id' => 10, 'name' => 'id10'); $a[] = array('parent_id' => 7, 'category_id' => 11, 'name' => 'id11'); $a[] = array('parent_id' => 8, 'category_id' => 12, 'name' => 'id12'); $a[] = array('parent_id' => 10, 'category_id' => 13, 'name' => 'id13'); return $a; } } $query = new A1; $categoryArray = array(); foreach($query->rows() as $row) { if(isset($categoryArray[$row['category_id']])) { $categoryArray[$row['parent_id']] = $row['category_id']; } else { $categoryArray[$row['parent_id']][$row['category_id']] = $row['name']; } } print_r($categoryArray);