父子关系列表转树形结构

list2Tree.php

/**
* 创建树形结构
* @param  [type] $data      [description]
* @param  [type] $parent_id [description]
* @return [type]            [description]
*/
public function getTree($data,$parent_id){
    $result= array();//结果数组
    $len = 0;
    for($i=0;$i<count($data);$i++){
        if($data[$i]['parent_id'] === $parent_id){
            $result[$len] = $data[$i];
            $children = $this->getTree($data,$data[$i]['id']);
            if(count($children)>0){
                $result[$len]['children ']= $children;
            }
            $len++;
        }
    }
    return $result;
}