如何在PHP中随机循环第一层嵌套关联数组 - How to randomly loop through first layer of nested associative array in PHP?

How to randomly loop through first layer of nested associative array in PHP?

我有一个嵌套的关联数组，它看起来像这样:

$myarray = array(
  ['tiger'] => array(
    ['people'], ['apes'], ['birds']
  ),
  ['eagle'] => array(
    ['rodents'] => array(['mice'], ['squirrel'])
  ),
  ['shark'] => ['seals']
);

我如何以随机顺序循环第一层(老虎，鹰，鲨鱼)并确保我在循环中覆盖所有它们?我在看PHP函数shuffle();，但是我认为这个函数打乱了所有的层，打乱了整个数组。

您可以像这样对数组随机排序，它将保留键和值

<?php
$myarray = array(
  'tiger' => array(
    'people', 'apes', 'birds'
  ),
  'eagle' => array(
    'rodents' => array('mice', 'squirrel')
  ),
  'shark' => 'seals'
);
$shuffleKeys = array_keys($myarray);
shuffle($shuffleKeys);
$newArray = array();
foreach($shuffleKeys as $key) {
    $newArray[$key] = $myarray[$key];
}
print_r($newArray);

您可以使用array_keys()获取密钥。然后可以使用shuffle()对结果键数组进行洗牌，并对其进行迭代。

的例子:

$keys = array_keys($myarray);
shuffle($keys);
foreach ($keys as $key) {
  var_dump($myarray[$key]);
}

根据我的测试，shuffle只随机化1层。你自己试试吧:

<?php
$test = array(
        array(1,2,3,4,5),
        array('a','b','c','d','e'),
        array('one','two','three','four','five')
    );
shuffle($test);
var_dump($test);
?>