【问题标题】：Swap array Item with condition用条件交换数组项
【发布时间】：2011-07-09 05:19:34
【问题描述】：

我有用条件交换数组的情况。我的数组绘制在下面。

pid => 类似于 mysql 中的主键，因此它可能会丢失它的顺序
type=> type 表示，product type.array 有 3 种产品。
Name=> 仅表示产品名称

首先我在 mysql 中尝试了解决方案，但没有任何好的迹象。其中一些建议我使用数组交换更好。但我不知道如何获得这个。

我的问题

我有物品清单。当我列出产品时，类型 3（母校）不应出现在 5、10、15 （即 5 个模块）位置。如果它让我的设计崩溃。

截图说明

所以我想确保类型 3(master) 永远不会出现在 mod 的 5 位置。我该怎么做帮帮我

我之前在mysql中的尝试here

    Array
    (
        [0] => Array
            (
                [pid] => 1
                [type] => 1
                [name] => A
            )

    [1] => Array
        (
            [pid] => 2
            [type] => 1
            [name] => B
        )

    [2] => Array
        (
            [pid] => 3
            [type] => 2
            [name] => D
        )

    [3] => Array
        (
            [pid] => 4
            [type] => 3
            [name] => E(master)
        )

    [4] => Array
        (
            [pid] => 5
            [type] => 3
            [name] => f(sub)
        )

    [5] => Array
        (
            [pid] => 6
            [type] => 1
            [name] => A1
        )

    [6] => Array
        (
            [pid] => 7
            [type] => 2
            [name] => B1
        )

    [7] => Array
        (
            [pid] => 8
            [type] => 1
            [name] => C1
        )

    [8] => Array
        (
            [pid] => 9
            [type] => 2
            [name] => D1
        )

    [9] => Array
        (
            [pid] => 10
            [type] => 3
            [name] => E1(master)
        )

    [10] => Array
        (
            [pid] => 11
            [type] => 3
            [name] => A2(sub)
        )

    [11] => Array
        (
            [pid] => 12
            [type] => 2
            [name] => B2
        )

    [12] => Array
        (
            [pid] => 13
            [type] => 1
            [name] => C2
        )

    [13] => Array
        (
            [pid] => 14
            [type] => 2
            [name] => D2
        )

    [14] => Array
        (
            [pid] => 15
            [type] => 1
            [name] => E2
        )

)

提前致谢

【问题讨论】：

如果你交换的位置也会折叠你的设计，因为1个master占用了2个。
@jagadeesan：我希望我能理解你写的内容

标签： php arrays swap

【解决方案1】：

我试了一下，下面的代码应该可以解决问题。我建议您将块拆分为定义块的几个子部分。此外，它不是很干的代码，但它会给你一个想法：

<?php

$grid = array(); $blocks = array();

$blocks[] = array(array("pid" => 1, "type" => 1, "name" => "A")); 
$blocks[] = array(array("pid" => 2, "type" => 1, "name" => "B")); 
$blocks[] = array(array("pid" => 3, "type" => 2, "name" => "D")); 
$blocks[] = array(array("pid" => 4, "type" => 3, "name" => "E(master)"), array("pid" => 5, "type" => 3, "name" => "F (sub)")); 
$blocks[] = array(array("pid" => 6, "type" => 1, "name" => "A1")); 
$blocks[] = array(array("pid" => 7, "type" => 2, "name" => "B1")); 
$blocks[] = array(array("pid" => 8, "type" => 1, "name" => "C1")); 
$blocks[] = array(array("pid" => 9, "type" => 2, "name" => "D1")); 
$blocks[] = array(array("pid" => 10, "type" => 3, "name" => "E1 (master)"), array("pid" => 11, "type" => 3, "name" => "A2 (sub)")); 
$blocks[] = array(array("pid" => 12, "type" => 2, "name" => "B2")); 
$blocks[] = array(array("pid" => 13, "type" => 1, "name" => "C2")); 
$blocks[] = array(array("pid" => 14, "type" => 2, "name" => "D2")); 
$blocks[] = array(array("pid" => 14, "type" => 1, "name" => "E2"));

$current_row = 0;

for ($n=0;$n < count($blocks);$n++) {

    //Check if current row exists in grid
    if (!isset($grid[$current_row]))
    {
        //Create new empty row in grid
        $grid[$current_row] = array();
    }

    //check if current block fits
    if (count($grid[$current_row]) + count($blocks[$n]) > 5)
    {
        // Block doesn't fit: Search for block that fits
        for ($i=$n;$i < count($blocks);$i++)
        {
            if (count($grid[$current_row]) + count($blocks[$i]) <= 5)
            {
                //place parts in block on current row
                foreach ($blocks[$i] as $part)
                {
                    $grid[$current_row][] = $part;
                }

                //unset block from queue
                unset($blocks[$i]);
            }
        }

        //place current block on new row
        $current_row++;
    }

    //place parts in block in grid
    foreach ($blocks[$n] as $part)
    {
        $grid[$current_row][] = $part;
    }
}

print_r($grid); 
?>

【讨论】：