Question

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

我想通过这种方式获得 $ array ['EUR'] ['rate']

如何通过这种方式获得。请帮助

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
    )
)

我想得到

Answer 1

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

您可能希望对数组进行格式化，以便能够直接访问数据而不会循环。因此，您可以使用货币作为密钥。

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']

Answer 2

将其粘贴在getCurrency函数中。然后只需传递您想要的一个和数组：

<?php

$x = [
    [
            'id' => 1,
            'name' => 'Andorra',
            'code' => 'AD',
            'currency' => 'EUR',
            'phone' => '+376',
            'rate' => '5727.21',
        ],

[
        'id' => 2,
        'name' => 'United Arab Emirates',
        'code' => 'AE',
        'currency' => 'AED',
        'phone' => '+971',
        'rate' => '24341.9',
    ]
];

function getCurrency($code, $currenciesArray)
{
    foreach ($currenciesArray as $row) {
        if ($row['currency'] == $code) {
            return $row;
        }
    }

    return false;
}

$currency = getCurrency('EUR', $x);
echo $currency['rate'];  // outputs 5727.21

在这里https://3v4l.org/DnDQo

Answer 3

尝试此功能：

function formatArray($array){
   $return = [];
   foreach($array as $arrayItem){
     $return[$arrayItem['currency']] = $arrayItem;
   }
   return $return;
}

当前数组

    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
        )
    )

因此使用此功能

print_r(formatArray($array));

arry将转换为此：

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

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

然后您可以尝试这样：

echo $array['EUR']['rate'];

如何使用特定列名作为数组索引来获取特定列的结果？

3 个答案: