如何在PHP多维数组中列出特定值

Question

我有一个多维数组，如下所示：

$neighborhood => array(
  'the_smiths' => array(
    'dad'      => 'Donald',
    'mom'      => 'Mary',
    'daughter' => 'Donna',
    'son'      => 'Samuel'
  )
  'the_acostas' => array(
    'dad'      => 'Diego',
    'mom'      => 'Marcela',
    'daughter' => 'Dominga',
    'son'      => 'Sergio'
  )
);

我想创建另一个数组(让我们称之为$array_of_moms(，它包含附近所有的妈妈。将它们单独放入是可行的，但不实用(就像这样(：

$array_of_moms = array(
  $neighborhood['the_smiths']['mom'],
  $neighborhood['the_acostas']['mom'],
)

我如何创建这样的东西：

$array_of_moms = $neighborhood['mom'];

Answer 1

$moms = array();
foreach($neighborhood as $family)
{
    $moms[] = $family['mom'];
}

这将遍历数组中的每个族，并将mom添加到新的$moms数组中。

Answer 2

使用foreach，您可以遍历具有可变标记的数组。

$array_of_moms = array();
foreach ($neighborhood AS $family) {
    $array_of_moms[] = $family['mom']; // append mom of each family to array
}

Answer 3

如果你可以操作你的数组，你可以：

<?php
$neighborhood = array(
  'families' => array(
    'the_smiths' => array(
      'dad'      => 'Donald',
      'mom'      => 'Mary',
      'daughter' => 'Donna',
      'son'      => 'Samuel'
      ),
    'the_acostas' => array(
      'dad'      => 'Diego',
      'mom'      => 'Marcela',
      'daughter' => 'Dominga',
      'son'      => 'Sergio'
    )
  )
);
foreach ($neighborhood['families'] as $family => $folks) {
    $neighborhood['moms'][] = $folks['mom'];
}
print_r($neighborhood);
?>

哪个输出：

Array
(
    [families] => Array
        (
            [the_smiths] => Array
                (
                    [dad] => Donald
                    [mom] => Mary
                    [daughter] => Donna
                    [son] => Samuel
                )
            [the_acostas] => Array
                (
                    [dad] => Diego
                    [mom] => Marcela
                    [daughter] => Dominga
                    [son] => Sergio
                )
        )
    [moms] => Array
        (
            [0] => Mary
            [1] => Marcela
        )
)

http://codepad.org/xbnj5UmV