Question

我在如何使用javascript列出数组子项时遇到了麻烦。这是我在php中的代码：

$arr = array();
foreach ($categories as $key => $cat) {
    if($cat['parent_id'] == 0){
    $arr[$cat['id']] = $cat;

    }else{
        $arr[$cat['parent_id']][] = $cat;
    }
}

输出是：

Array ( 
[1] => Array (
     [id] => 1
      [parent_id] => 0
      [name] => A 
        [0] => Array (
             [id] => 2 
             [parent_id] => 1
              [name] => B 
        ) 
        [1] => Array (
            [id] => 3
            [parent_id] => 1 
            [name] => C 
         ) 
        [2] => Array (
             [id] => 4 
             [parent_id] => 1
             [name] => D
        )
 ) 
 [5] => Array (
         [id] => 5
         [parent_id] => 0
         [name] => E
            [0] => Array (
               [id] => 6
               [parent_id] => 5
               [name] => F
             ) 
             [1] => Array (
                 [id] => 7
                 [parent_id] => 5
                 [name] => G
        )
)

这是我想用javascript或php创建的输出：

Answer 1

尝试：

print_r($cat[1][name]);

结果是什么？

Answer 2

$paren_arr = array("id"=>0, "children"=>array()); // Top parent category:
foreach ($arr as $key=>$child ) {
    /*If parent of current array is TOP (parent_id==0) 
        Add to TOP parent array. (TOP['children'][] = current array)
      Else
        Walk through each children of TOP parent. (parent_id!=0)
        If child of TOP parent's ID is Parent id of current array
            Add to TOP parent->child, this array. (TOP['children']['CHILD_ID'][] = current)
    */
    if ( !is_array($param) )
        continue;

    if ( $param['parent_id']==0 ) {
        $paren_arr['children'][$param['name']] = $param;
    } else {
        foreach ( $paren_arr['children'] as $name=>$child_param ) {
            if ( $param['parent_id']==$child_param['id'] ) {
                $paren_arr['children'][$name]['children'][$param['name']] = $param;
            }
        }
    }
}

可以优化此函数（使用递归）以使用不同的嵌套级别。

如何在javascript / php

2 个答案: