如何按键比较两个关联数组

时间:2016-01-14 18:46:07

标签: php arrays associative-array

我正在尝试比较两个关联数组,并根据值和基于键获得差异。我尝试过使用带有闭包的array_filter

这两个数组是这样的:

数组1

$newArr = [
    0 => [
        'id' => 'UT5',
        'qty' => '4'
    ],
    1 => [
        'id' => 'WRO',
        'qty' => '3'
    ],
    2 => [
        'id' => 'SHO',
        'qty' => '3' 
    ]
];

数组2

$oldArr = [
    0 => [
        'id' => 'SHO',
        'qty' => '1'
    ],
    1 => [
        'id' => 'UT5',
        'qty' => '2'
    ],
];

我想要的输出如下:

array(3) 
{ 
  ["UT5"]=> int(2) 
  ["SHO"]=> int(2) 
  ["WRO"]=> int(3)
} 

我已经走到了这一步:

<?php

$newArr = [
    0 => [
        'id' => 'UT5',
        'qty' => '4'
         ],
    1 => [
        'id' => 'WRO',
        'qty' => '3'
    ],
    2 => [
        'id' => 'SHO',
        'qty' => '3'
    ]
];

$oldArr = [
    0 => [
        'id' => 'SHO',
        'qty' => '1'
    ],
    1 => [
        'id' => 'UT5',
        'qty' => '2'
    ],
];

$toAdd = [];
foreach ($newArr as $item) {
    $itemsToAdd = array_walk($oldArr, function ($k) use ($item, &$toAdd) {
        if ($k['id'] == $item['id']) {
            $toAdd[$k['id']] = max($k['qty'], $item['qty']) - min($k['qty'], $item['qty']);
        }
    });
}

var_dump($toAdd); die();

但是使用此功能,我当前的输出是:

array(2) { 
    ["UT5"]=> int(2) 
    ["SHO"]=> int(2) 
}

请注意,缺少WRO。有没有办法可以添加条件来准确检查?我尝试了一些解决方案,例如!in_array,但是它们都没有给我所需的输出。

任何帮助表示赞赏!谢谢!

2 个答案:

答案 0 :(得分:1)

这很简单,只有在两个数组中都存在密钥时,您的代码才会保存值。只需添加一个子句来检查旧数组中是否存在密钥DOESN&T。 (如果旧数组有一个没有新密钥的密钥,则也会相反)

if (!isset(old array [ new array key ]){
$newArray[new array key] = new array key and values;

您的程序结构针对计算机进行了优化,并且过于复杂而无法作为人类使用,我完全重写了它。

<?php
$newArr = [0 => ['id' => 'UT5', 'qty' => '4'], 1 => ['id' => 'WRO', 'qty' => '3'], 2 => ['id' => 'SHO', 'qty' => '3']];

$oldArr = [0 => ['id' => 'SHO', 'qty' => '1'], 1 => ['id' => 'UT5', 'qty' => '2'], ];

$newReset = [];
foreach( $newArr as $item ) {
    $newReset[$item['id']] = $item['qty'];
}

$oldReset = [];
foreach( $oldArr as $item ) {
    $oldReset[$item['id']] = $item['qty'];
}

foreach( $newReset as $key => $val ) {
    if( isset( $oldReset[$key] ) ) {
        $toAdd[$key] = max( $oldReset[$key], $val ) - min( $oldReset[$key], $val );
    }
    else $toAdd[$key] = intval($val);
}

var_dump( $toAdd );

这就是结果。

array(3) {
      ["UT5"]=>
      int(2)
      ["WRO"]=>
      int(3)
      ["SHO"]=>
      int(2)
    }

答案 1 :(得分:1)

一次通过

$toAdd = [];
foreach ($newArr as $item) 
   $toAdd[$item['id']] = $item['qty'];
foreach ($oldArr as $item) 
   if (isset($toAdd[$item['id']])) 
       $toAdd[$item['id']] = abs($toAdd[$item['id']] - $item['qty']);
   else 
       $toAdd[$item['id']] = abs($item['qty']);
print_r($toAdd);