Mutilple Array puzzel

Question

我有一个数组：

GET

我需要打印输出：

Foo

Answer 1

这里你的代码编写得非常糟糕，但适用于你的问题。数组维度必须为4 * 4.

<?php
$myArrays = array(
    array(1, 2, 3, 4),
    array(5, 6, 7, 8),
    array(9, 10, 11, 12),
    array(13, 14, 15, 16)
);

$counter1 = 0;

while($counter1 < 4)
{
    echo $myArrays[$counter1][0];
    echo "\n";
    $counter1++;
    }

    $counter1 = 3;

    while($counter1 >= 0)
    {
        echo $myArrays[$counter1][1];
        echo "\n";
        $counter1--;        
    }

    $counter1 = 0;

    while($counter1 < 4)
    {
        echo $myArrays[$counter1][2];
        echo "\n";
        $counter1++;
    }

    $counter1 = 3;

    while($counter1 >= 0)
    {
        echo $myArrays[$counter1][3];
        echo "\n";
        $counter1--;
    }
    ?>   

Answer 2

你可以尝试这是

$myArrays = array(
    array(1, 2, 3, 4),
    array(5, 6, 7, 8),
    array(9, 10, 11, 12),
    array(13, 14, 15, 16)
);
$i = 0;
foreach($myArrays as $key => $value){
  $i = $key;
  foreach($value as $keys =>$values){
     $addArray[$i] = $values;
     $i = $i+4;      
    }
}

ksort($addArray);
$arrays = array_chunk($addArray,4);
krsort($arrays[1]);
krsort($arrays[3]);
$final = array_merge($arrays[0],$arrays[1],$arrays[2],$arrays[3]);
foreach ( $final as $key => $value){
     echo $value ."<br>";
}

Answer 3

使用array_map，array_column和array_reverse的组合：

$myArrays = array(
    array(1, 2, 3, 4),
    array(5, 6, 7, 8),
    array(9, 10, 11, 12),
    array(13, 14, 15, 16)
);

$index = 0;
$myArrays = array_map(function ($v) use (&$index, $myArrays) {
    if (($index % 2) != 0) {
        echo implode("\n", array_reverse(array_column($myArrays, $index))) . "\n";
    } else {
        echo implode("\n", array_column($myArrays, $index)) . "\n";
    }

    $index++;
}, $myArrays);

现场演示：https://3v4l.org/0m2jZ

使用foreach而不是array_map

foreach ($myArrays as $index => $myArray) {
    if (($index % 2) != 0) {
        echo implode("\n", array_reverse(array_column($myArrays, $index))) . "\n";
    } else {
        echo implode("\n", array_column($myArrays, $index)) . "\n";
    }
}

现场演示：https://3v4l.org/RNC9R

两者都将输出以下内容：

1
5
9
13
14
10
6
2
3
7
11
15
16
12
8
4