循环遍历数组并用键的相同值进行累加。

Question

这是样本json编码的数组-

[
    {"item_id":"8057","category":"MEN'S CLOTHING","quantity":"3.000"},
    {"item_id":"22647","category":"WOMEN'S CLOTHING","quantity":"7.000"},        
    {"item_id":"1556","category":"MEN'S CLOTHING","quantity":"2.000"},
    {"item_id":"4179","category":"WOMEN'S CLOTHING","quantity":"1.000"},
    {"item_id":"21218","category":"WOMEN'S CLOTHING","quantity":"2.000"}
]

我想把quantity加到同一个category上。

需要最终结果就像-

"MEN'S CLOTHING" : 5,
"WOMEN'S CLOTHING": 10

注意:键“类别”的值是动态的。

Answer 1

你可以试试这样的东西：

$dataArray = json_decode($jsonArray, true);
     $allValuesWithCount = array(); 
    foreach($dataArray as $arrayValues) {    
        $allValuesWithCount[$arrayValues['category']] += $arrayValues['quantity'];
     } 
    print_r($allValuesWithCount);

Answer 2

您可以使用下面的代码来实现这一点：

    $json = json_decode($string,true);

    $allCount = [];
    foreach ($json as $key => $value){
        $allCount[$value['category']] += $value['quantity'];
    }
    foreach ($allCount as $category => $value){
        echo $category ." : ".$value."<br>";
    }

但是，当我通过控制台以不同的PHP版本运行它时，它会给出警告并显示如下结果：

PHP注意:未定义索引:第15行中的男装in /home/akshay/so.php跟踪: PHP 1. {main}() /home/akshay/so.php:0 PHP注意:未定义索引:第15行中的女装in /home/akshay/so.php跟踪: PHP 1. {main}() /home/akshay/so.php:0

MEN'S CLOTHING : 5
WOMEN'S CLOTHING : 10