如何在多维数组中转置和内插子数组数据以创建平面输出数组？

Question

我没有指定数量的子数组，但是我的数据结构看起来像这样：

array(("john","alex","tyler"),("1","2","3"),("brown","yellow","green"));

上面的示例有3个子数组，但问题是此数字可以更改。

作为最终输出，在此示例中，我需要一个包含3个字符串的数组。

array("john,1,brown","alex,2,yellow","tyler,3,green");

我尝试用函数编写此函数，但找不到解决方案。

Answer 1

使用call_user_func_array，array_map和array_merge功能的解决方案：

$arr = [["john","alex","tyler"],["1","2","3"],["brown","yellow","green"]];

$groups = call_user_func_array("array_map", array_merge([null], $arr));
$result = array_map(function ($v) {
    return implode(",", $v);
}, $groups);

print_r($result);

输出：

Array
(
    [0] => john,1,brown
    [1] => alex,2,yellow
    [2] => tyler,3,green
)

http://php.net/manual/en/function.call-user-func-array.php

Answer 2

使用argument unpacking（php 5.6+）的简单方法

<?php

$array = array(array("john","alex","tyler"),array("1","2","3"),array("brown","yellow","green"));

$result = array_map(function(...$elements) { return implode(",", $elements); }, ...$array);

print_r($result);

与其他回复相同。

---

这里是更详细的内容：

array_map(/* anonymomous function */, ...$array);

...$array提取嵌套数组并将其解包，就像您要调用

array_map(/* anonymomous function */, $array[0], $array[1], ... $array[n])

[array_map可以采用多个数组，并将给定的可调用项应用于每个回合。

而匿名函数或多或少地相反

function(...$elements) { return implode(",", $elements); }

[...$elements接受任意数量的参数，并将它们变成一个数组，然后将其连接成一个字符串。

Answer 3

这里我们通过将数组行转换为列来更改数组的值。然后用逗号（,）插入每个数组。例如：array[1][0]将变为array[0][1]等

PHP code demo

<?php
$array=array(
        array("john","alex","tyler"),
        array("1","2","3"),
        array("brown","yellow","green")
);
$result=array();
for($x=0;$x<count($array);$x++)
{
    for($y=0;$y<count($array[$x]);$y++)
    {
        $result[$x][$y]=$array[$y][$x];//changing array values
    }
}
foreach($result as $key => $value)
{
    $result[$key]=  implode(",", $value);//combining array values on comma(,)
}
print_r($result);

输出：

Array
(
    [0] => john,1,brown
    [1] => alex,2,yellow
    [2] => tyler,3,green
)

Answer 4

@@ ultradurable3这也可以完成array_column（），这里您不必担心子数组的数量，请尝试如下操作：

<?php
$array =  array(array("john","alex","tyler"), array("1","2","3"), array("brown","yellow","green"));
$finalArr = array(implode(",", array_column($array, 0)), implode(",", array_column($array, 1)), implode(",", array_column($array, 2)));
echo "<pre>";
print_r($finalArr);