PHP-如何基于键减少数组'；s值

我有这样一个数组：

Array
(
    [0] => Array
        (
            [CommodityID] => 10
            [RetailerID] => 1798
            [Name] => Petrol
            [City] => Parow
            [Line1] => 49 Fifth Avenue
            [Line2] => 
            [Line3] =>  
            [ContractorName] => BP Fifth Ave Motors Parow
            [AreaCode] => 021
            [Number] => 9305025
            [Latitude] => -33.896493
            [Longitude] => 18.579302
            [LogoUrl] => https://webservices.test.com/ContractorLogos/bp.png
            [dist] => 0.00
        )

    [1] => Array
        (
            [CommodityID] => 10
            [RetailerID] => 1798
            [Name] => Petrol
            [City] => Parow
            [Line1] => 49 Fifth Avenue
            [Line2] => 
            [Line3] =>  
            [ContractorName] => BP Fifth Ave Motors Parow
            [AreaCode] => 021
            [Number] => 9305025
            [Latitude] => -33.896493
            [Longitude] => 18.579302
            [LogoUrl] => https://webservices.test.com/ContractorLogos/bp.png
            [dist] => 0.00
        )

    [2] => Array
        (
            [CommodityID] => 22
            [RetailerID] => 1758
            [Name] => Jewellers
            [City] => Parow
            [Line1] => Shop 4
            [Line2] => Mc Intyre Square
            [Line3] => Mc Intyre Road
            [ContractorName] => Du Plessis Manufacturing Jewellers Parow
            [AreaCode] => 021
            [Number] => 9300788
            [Latitude] => -33.895200
            [Longitude] => 18.586710
            [LogoUrl] => https://webservices.test.com/ContractorLogos/DuPlessisJewellers.png
            [dist] => 0.01
        )
)

我只想拥有唯一的[RetailerID]，即：

Array
(
    [0] => Array
        (
            [CommodityID] => 10
            [RetailerID] => 1798
            [Name] => Petrol
            [City] => Parow
            [Line1] => 49 Fifth Avenue
            [Line2] => 
            [Line3] =>  
            [ContractorName] => BP Fifth Ave Motors Parow
            [AreaCode] => 021
            [Number] => 9305025
            [Latitude] => -33.896493
            [Longitude] => 18.579302
            [LogoUrl] => https://webservices.test.com/ContractorLogos/bp.png
            [dist] => 0.00
        )

    [1] => Array
        (
            [CommodityID] => 22
            [RetailerID] => 1758
            [Name] => Jewellers
            [City] => Parow
            [Line1] => Shop 4
            [Line2] => Mc Intyre Square
            [Line3] => Mc Intyre Road
            [ContractorName] => Du Plessis Manufacturing Jewellers Parow
            [AreaCode] => 021
            [Number] => 9300788
            [Latitude] => -33.895200
            [Longitude] => 18.586710
            [LogoUrl] => https://webservices.test.com/ContractorLogos/DuPlessisJewellers.png
            [dist] => 0.01
        )
)      

---

我尝试了array_unique，但基于所有列，它似乎都是唯一的。是否有一个php内置函数可以通过只查看一个数组键的值来执行此操作？

将迭代数组一次，并仅保存该字段的唯一值一次，例如：

$newArray = array();
foreach($array as $item) {
$newArray[$item['RetailerID']] = $item;
}

这将始终只保存相同类型的最后一项。您可以修改逻辑以满足您的需要。 另一种更安全的可能性是保存唯一值并检查它们：

$exists = array();
$newArray = array();
    foreach($array as $item) {
    if(!in_array($item['RetailerID'],$exists)){
       $newArray[$item['RetailerID']] = $item;
       $exists[] = $item['RetailerID'];
     }

    }

---

可能的复制品：[可能的复制品谢谢你，先生。工作得很好。