如何简化具有单个对象属性的数组数组[重复]

Question

我有以下数据结构：

$campaigns =
Array
(
[0] => Array
    (
        [subject] => cca-cpg
    )

[1] => Array
    (
        [subject] => cleanup-cpg
    )

[2] => Array
    (
        [subject] => gas-cpg
    )

[3] => Array
    (
        [subject] => pollinators-cpg
    )

)

我想结束的是：

$campaigns = ['cca-cpg','clean_up-cpg','gas-cpg','pollinators-cpg'];


this will work:
$newCampaigns=[];
for($i=0;$i<count($campaigns);$i++){
   array_push($newCampaigns,$campaigns[$i]['subject'];
}

但我想知道是否有更好的方法来做到这一点。数据直接来自mysql数据库

Answer 1

array_column() 功能适合你：

$newCampaigns = array_column($campaigns, 'subject');

来源：https://www.php.net/manual/en/function.array-column.php