Question

我有以下数组

$country["china"] = array(
  "shortcode" => "CN",
  "president" => "Xi Jinping",
  "currency" => "Yuan",
  );

$country["america"] = array(
  "shortcode" => "US",
  "president" => "Barack Obama",
  "currency" => "Dollar",
  );

$country["russia"] = array(
  "shortcode" => "RU",
  "president" => "Vladimir Putin",
  "currency" => "Rubble",
  );

现在我想提取上面每个数组的“总统”值。

我试过这个

foreach(array_keys($country) as $countryName => $countryvalue)
  echo  $countryvalue . "<br>";

我希望获得此输出习近平巴拉克奥巴马弗拉基米尔·普京

但我获得了一份国家名单。

Answer 1

试试这个

foreach($country as $c)
{
  echo $c["president"]."<br/>";
}

Answer 2

foreach($country as $countryName => $countryvalue){
   echo $val["president"];
}

Answer 3

试试这个

$country["china"] = array(
  "shortcode" => "CN",
  "president" => "Xi Jinping",
  "currency" => "Yuan",
  );

$country["america"] = array(
  "shortcode" => "US",
  "president" => "Barack Obama",
  "currency" => "Dollar",
  );

$country["russia"] = array(
  "shortcode" => "RU",
  "president" => "Vladimir Putin",
  "currency" => "Rubble",
  );


foreach($country as $key=>$val){
    echo $val["president"];
}

Answer 4

试试这个

foreach($country as $key => $value) {
       echo $value['president']."<br/>";

  }

Answer 5

我强烈建议您将所有这些内容放入数据库并使用简单查询访问数据。

// Your table
CREATE TABLE `country`
(
    id serial primary key
    , name varchar(64)
    , shortcode varchar(2)
    , president varchar(64)
    , currency varchar(24)
);

// Insert data
INSERT INTO `country`
    ( name, shortcode, president, currency )
VALUES
    ( 'china', 'CN', 'Xi Jinping', 'Yuan' )
    , ( 'america', 'US', 'Barack Obama', 'Dollar' )
    , ( 'russia', 'RU', 'Vladimir Putin', 'Rubble' );

现在要访问，只需编写简单的查询：

SELECT president FROM country WHERE name = 'china';

PS：通过这种方式更新数据会更容易，您无需更改代码。

PHP数组从各种数组中提取特定键值？

5 个答案: