PHP实现无限级分类

 ???function generateTree(){ ???????$items = array( ???????????1 => array(‘id‘ => 1, ‘pid‘ => 0, ‘name‘ => ‘安徽省‘), ???????????2 => array(‘id‘ => 2, ‘pid‘ => 0, ‘name‘ => ‘浙江省‘), ???????????3 => array(‘id‘ => 3, ‘pid‘ => 1, ‘name‘ => ‘合肥市‘), ???????????4 => array(‘id‘ => 4, ‘pid‘ => 3, ‘name‘ => ‘长丰县‘), ???????????5 => array(‘id‘ => 5, ‘pid‘ => 1, ‘name‘ => ‘安庆市‘), ???????); ???????$tree = array(); ???????foreach($items as $item){ ???????????if(isset($items[$item[‘pid‘]])){ ???????????????$items[$item[‘pid‘]][‘son‘][] = &$items[$item[‘id‘]]; ???????????}else{ ???????????????$tree[] = &$items[$item[‘id‘]]; ???????????} ???????} ???????????????echo "<pre>"; ???????print_r($tree); ???}