使用PHP将项目数计数到多维数组中

Question

假设我有这个数组：

Array
(
    [Europa] => Array
        (
            [country] => France
            [capital] => Paris
        ),
        (
            [country] => Spain
            [capital] => Madrid
        )
    [Asia] => Array
        (
            [country] => Russia
            [capital] => Moscow
        )
)

如何计算Asia或Europa`中包含的项目数？

谢谢。

Answer 1

假设

  $myArray= [
    'Europa' => [
            'country' => France
            'capital' => Paris
        ],
        [
            'country' => Spain
            'capital' => Madrid
        ],
    'Asia' => [
            'country' => Russia
            'capital' => Moscow
        ],
  ];

您可以基于索引使用count（）

$numEuropa = count($myArray['Europa']);
$numAsia = count($myArray['Asia']);

Answer 2

将count中的array_map用作：

$cnts = array_map("count", $array);

或带有循环：

foreach($array as $key => $val)
    echo $key . " count is: " . count($value);

实时示例：3v4l