php - 如何使用特定列名作为数组索引来获取特定列的结果？

Question

我有一个数组，我想通过传递currency参数来获取结果。例如 $array 是包含数组的变量。

我想通过这种方式$array['EUR']['rate']

我该如何走这条路。请帮忙

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => Andorra
            [code] => AD
            [currency] => EUR
            [phone] => +376
            [rate] => 5727.21
        )

[1] => Array
    (
        [id] => 2
        [name] => United Arab Emirates
        [code] => AE
        [currency] => AED
        [phone] => +971
        [rate] => 24341.9
    )
)

我想要得到

Answer 1

foreach ($array as $currency) {
    if ($currency['currency'] == 'EUR') {
        echo $currency['rate'];
    }
}

您可能希望以不同的方式格式化数组，以便能够直接访问数据而无需循环。所以你可以使用货币作为 key 。

您可以像这样重新格式化数组:

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

然后访问$newArray['EUR']['rate']