Question

我正在尝试根据值将数组项移动到子数组中，例如：

Array
(
    [0] => Array
    (
        [Desc] => 'Sub category'
        [SubID] => null
    )
    [1] => Array
    (
        [Desc] => 'Listed item 1'
        [SubID] => 1
    )
    [2] => Array
    (
        [Desc] => 'Listed item 2'
        [SubID] => 1
    )
    [3] => Array
    (
        [Desc] => 'Item with no sub category'
        [SubID] => null
    )
)

会变成：

Array
(
    [0] => Array
    (
        [Desc] => 'Sub category'
        [SubID] => null
        [SubSections] => Array
            (
                [Desc] => 'Listed item 1'
                [SubID] => 1
            )
            [2] => Array
            (
                [Desc] => 'Listed item 2'
                [SubID] => 1
            )
    )
    [3] => Array
    (
        [Desc] => 'Item with no sub category'
        [SubID] => null
    )
)

很抱歉模糊，我不确定描述它的最佳方式，但希望上面的例子是有道理的。

谢谢！

Answer 1

所以，我的解决方案可能不是最漂亮的，但它基于一个假设，即一个类别可能出现在数组中的一个子节点之后，因此我们首先计算出类别...然后再做一个循环来填充子类别

$arr = Array (
    [0] => Array
    (
        [Desc] => 'Sub category'
        [SubID] => null
    )
    [1] => Array
    (
        [Desc] => 'Listed item 1'
        [SubID] => 1
    )
    [2] => Array
    (
        [Desc] => 'Listed item 2'
        [SubID] => 1
    )
    [3] => Array
    (
        [Desc] => 'Item with no sub category'
        [SubID] => null
    ) ) 

$new_arr = array();

// sort out the categories first foreach ($arr as $key => $item) {

foreach ($arr as $key => $item) {

    if (is_null($itemp['SubID']))
    {

        $new_arr[$key] = array(
            'Desc' => $item['Desc'],
            'SubID' => null
        );

        unset($arr[$key]);

    }

}

foreach ($arr as $key => $item) {

    $new_arr[$key]['SubSections'][] = array(
        'Desc' => $item['Desc'],
        'SubID' => $item['SubID'] - 1
    );

}

Answer 2

我在数组[0] => title, [1] => parent

中裁剪了你的示例:)

<?php

$arr = array(
    1 => array( '1', 2),
    2 => array( '2', 0),
    3 => array( '3', 1),
    4 => array( '4', 1),
);

$result = array();

foreach( $arr as $key => &$item){
    // Root element
    if( $item[1] == 0){
        $result[] = &$item;
        continue;
    }

    // Any other element
    if( !isset( $arr[ $item[1]])){
        die( 'Missing index');
    }

    // Initialize new child elements or append to existing list
    if( !isset( $arr[ $item[1]][2])){
        $arr[ $item[1]][2] = array( &$item);
    } else {
        $arr[ $item[1]][2][] = &$item;
    }
}

print_r( $result);

警告：原始数组将被更改。

注意：我使用0作为根索引，而不是null ...实现了一个例子。

Answer 3

<?
foreach($arr as $index=>$subArr){
  if($subArr['SubID']){
    $arr[$subArr['SubID']-1]['SubSections'][] = $subArr;
    unset($arr[$index]);
  }
}
?>

我认为这将完成这项工作。

可能隐含一些修饰

Answer 4

使用此

<?php
 $array = array(
                array('desc'=>'Sub Category 1','subid' => null),
                array('desc' => 'list item 1','subid' => 1),
                array('desc' => 'list item 2','subid' => 1),
                array('desc'=>'Sub Category 2','subid' => null)
            );


    foreach ($array as $key => $val){
     if ($val['subid']){
      $sub_array = $val;
      if (is_array($array[$val['subid']-1]['subsections'])){
        $array[$val['subid']-1]['subsections'][] = $val;
      }else{
        $array[$val['subid']-1]['subsections'] = array($val);
      }
      unset($array[$key]);
     }
    }
    print_r($array);
?>

基于值移动到PHP中的子数组

4 个答案: