数组 РHP 中的层次结构

Hierarchy in the array РHP

本文关键字：层次结构 HP 数组 | 更新日期: 2024-06-23

我有一个构建树数组的函数。例：

Array
(
    [0] => Array
        (
            [id] => 12
            [address] => 'Ukraine'
            [parent_id] => 0
            [children] => Array
                (
                    [0] => Array
                        (
                            [id] => 11
                            [address] => Crimea
                            [parent_id] => 12
                            [children] => Array
                                (
                                    [0] => Array
                                        (
                                            [id] => 16
                                            [address] => Yalta
                                            [parent_id] => 11
                                )
                        )
                )
        )
)

我有打印树的功能（我想获得缩进级别的输出）：

function printTree($data) {
    foreach ($data as $item) {
        if ($item['parent_id'] != 0) 
            echo ' - ' . $item['address'] . "<br>";
        else 
            echo $item['address'] . "<br>";
        if (isset($item['children'])) {
            printTree($item['children']);
        }
    }
}

但我的结果只有一个级别，因为我的if不正确：

Ukraine
 - Crimea
 - Yalta

我需要使用所有级别的缩进。我需要在if报表中更改哪些内容？

Ukraine
 - Crimea
 - Yalta

这样重写代码：

function printTree($data, $level = 0) {
    foreach ($data as $item) {
        if ($item['parent_id'] != 0) {
             /* here we corrects indent: */
             echo str_repeat('&nbsp;', $level) . ' - ' . $item['address'] . "<br>"; 
        } else {
             echo $item['address'] . "<br>";                   
        }
        if (isset($item['children'])) {
               printTree($item['children'], $level + 1);
        }
    }
}

您只需添加一个深度变量来控制要在每个子项之前添加多少空白：

<?php
$data = array(
    0 => array(
        'id' => 12,
        'address' => 'Ukraine',
        'parent_id' => 0,
        'children' => array(
            0 => array(
                'id' => 11,
                'address' => Crimea,
                'parent_id' => 12,
                'children' => array(
                    0 => array(
                        'id' => 16,
                        'address' => Yalta,
                        'parent_id' => 11,
                    )
                )
            )
        )
    )
);
printTree($data);
function printTree($data, $depth = 0) {
    foreach ($data as $item) {
        if ($item['parent_id'] != 0)
            echo str_repeat('&nbsp;', $depth), "- {$item['address']}'n"; 
        else
            echo "{$item['address']}'n";
        if (isset($item['children'])) {
            printTree($item['children'], ++$depth);
        }
    }
}

输出：

Ukraine
 - Crimea
  - Yalta

Hierarchy in the array РHP

输出：

工作演示。