PHP无限极分类操作（递归）

初始数据：

$arr = array(
array('id'=>1,'name'=>'电脑','pid'=>0),
array('id'=>2,'name'=>'手机','pid'=>0),
array('id'=>3,'name'=>'笔记本','pid'=>1),
array('id'=>4,'name'=>'台式机','pid'=>1),
array('id'=>5,'name'=>'智能机','pid'=>2),
array('id'=>6,'name'=>'功能机','pid'=>2),
array('id'=>7,'name'=>'超级本','pid'=>3),
array('id'=>8,'name'=>'游戏本','pid'=>3),
);

公共方法：（index.php）

public function getTree($arr,$id){
    $list =array();
    foreach ($arr as $k=>$v){
	if ($v['pid'] == $id){
	    $v['son'] = $this -> getTree($arr,$v['id']);
	    $list[] = $v;
	 }
    }
    return $list;
}

调用方法：

use app\common\controller\Index as commonIndex;
public function test(){
    	//引入公用数据
	$common = new commonIndex();
    	$arr = array(
		    array('id'=>1,'name'=>'电脑','pid'=>0),
		    array('id'=>2,'name'=>'手机','pid'=>0),
		    array('id'=>3,'name'=>'笔记本','pid'=>1),
		    array('id'=>4,'name'=>'台式机','pid'=>1),
		    array('id'=>5,'name'=>'智能机','pid'=>2),
		    array('id'=>6,'name'=>'功能机','pid'=>2),
		    array('id'=>7,'name'=>'超级本','pid'=>3),
		    array('id'=>8,'name'=>'游戏本','pid'=>3),
		);
	    $array = $common -> getTree($arr,0);
	    echo '<pre>';
	    dump($array);
    }

返回的数据样式：

array(2) {
  [0] => array(4) {
    ["id"] => int(1)
    ["name"] => string(6) "电脑"
    ["pid"] => int(0)
    ["son"] => array(2) {
      [0] => array(4) {
        ["id"] => int(3)
        ["name"] => string(9) "笔记本"
        ["pid"] => int(1)
        ["son"] => array(2) {
          [0] => array(4) {
            ["id"] => int(7)
            ["name"] => string(9) "超级本"
            ["pid"] => int(3)
            ["son"] => array(0) {
            }
          }
          [1] => array(4) {
            ["id"] => int(8)
            ["name"] => string(9) "游戏本"
            ["pid"] => int(3)
            ["son"] => array(0) {
            }
          }
        }
      }
      [1] => array(4) {
        ["id"] => int(4)
        ["name"] => string(9) "台式机"
        ["pid"] => int(1)
        ["son"] => array(0) {
        }
      }
    }
  }
  [1] => array(4) {
    ["id"] => int(2)
    ["name"] => string(6) "手机"
    ["pid"] => int(0)
    ["son"] => array(2) {
      [0] => array(4) {
        ["id"] => int(5)
        ["name"] => string(9) "智能机"
        ["pid"] => int(2)
        ["son"] => array(0) {
        }
      }
      [1] => array(4) {
        ["id"] => int(6)
        ["name"] => string(9) "功能机"
        ["pid"] => int(2)
        ["son"] => array(0) {
        }
      }
    }
  }
}

以上便是所有步骤流程，仁者见仁，智者见智，祝各位码农旗开得胜！