仅使用数组索引号从关联数组访问值

Question

首先我有这个关联数组

$players = array("group1" => array("player1" => "Kevin Durant", "player2" => "Kyrie Irving"), "group2" => array("player1" => "Demian Lillard", "player2" => "Derrick Rose"));

我知道我可以使用这种循环方式

//create an empty array to be used as a container for our looped array
$data_arrays = array();
foreach($players as $data=>$key):
    array_push($data_arrays,$key['player1'],$key['player2']);
endforeach;

但我想要的是根据数组索引获取值，例如

foreach($players as $data=>$key):
    array_push($data_arrays,$key[0],$key[1]);
endforeach;

但不幸和可悲的是，它返回了一个错误，

Undefined offset: 0

有什么帮助、线索、建议、建议、想法吗？

Answer 1

你可以使用 array_values():

foreach($players as $data=>$key):
    $groupPlayers = array_values( $key );
    array_push($data_arrays,$groupPlayers[0],$groupPlayers[1]);
endforeach;

附带说明：您对变量名 $data 和 $key 的使用相当不正统：键是数组元素的索引，数据通常被认为是数组的值元素。所以我建议切换它们，即：

foreach($players as $key=>$data):
    $groupPlayers = array_values( $data );
    array_push($data_arrays,$groupPlayers[0],$groupPlayers[1]);
endforeach;

Answer 2

像这样的东西会起作用：

<?php
$players = array("group1" => array("player1" => "Kevin Durant", "player2" => "Kyrie Irving"), "group2" => array("player1" => "Demian Lillard", "player2" => "Derrick Rose"));

$data_arrays = array();
foreach($players as $data => $key):
    $data_arrays = array_merge($data_arrays, array_values($key));
endforeach;

print_r($data_arrays);

演示：http://sandbox.onlinephpfunctions.com/code/e5133c3f317beccc5c2b0bbd56770359a1040c37

使用 array_reduce 的另一种更短的方法：

$players = array("group1" => array("player1" => "Kevin Durant", "player2" => "Kyrie Irving"), "group2" => array("player1" => "Demian Lillard", "player2" => "Derrick Rose"));

$players = array_reduce($players, function(&$players, $v) {return array_merge(array_values($players), array_values($v));}, array());

print_r($players);

演示：http://sandbox.onlinephpfunctions.com/code/92c51ac92fdfde40df3e4fc9d469d52d19f05376

仅使用数组索引号从关联数组访问值

access values from a associative array only using there array index number

php

arrays

associative-array

multidimensional-array