Question

我有一个元素数组，我需要在数组的开头更改元素，而我正在使用foreach。

Array
(
    [0] => Array
        (
            [0] => user
            [1] => address
            [2] => detail
            [3] => name
            [4] => family
        )

    [1] => Array
        (
            [0] => user
            [1] => address
        )

    [2] => Array
        (
            [0] => user
            [1] => address
            [2] => detail
            [3] => name
        )

)

我想要这个输出：

Array
(
    [0] => Array
        (
            [0] => user.address.detail.name
            [1] => family
        )

    [1] => Array
        (
            [0] => user
            [1] => address
        )

    [2] => Array
        (
            [0] => user.address.detail
            [1] => name
        )

)

这是我的代码，但似乎不起作用。

    $firstTemp = "";
    foreach ($temps as $row => $temp) {
        if (count($temp) > 2) {
            foreach ($temp as $k => $content) {

                $firstTemp .= $content . '.';
                $endTemp = end($temp);
            }
        }
    }

有没有更好，更简洁的方法来实现这一目标？

Answer 1

您可以pull the last element和implode()来自数组Like的其余元素：

$formatted = [];

foreach($temps as $arr) {

    if(count($arr) == 0){
       return;
    }

     $last = array_pop($arr);

    if(count($arr) > 0) //check if array not empty.
       $formatted[] = [implode(".", $arr), $last];
    else
       $formatted[] = [$last];   
}

Answer 2

我对您的代码段进行了一些修改以使其正常工作，

$result    = [];
foreach ($temps as $row => $temp) {
    if (count($temp) > 2) {
        // I am taking a slice of the array except for last element and imploding it with `.`
        // then I am fetching the last element of an array
        //  creating an array and pushing it into the result variable
        $result[] = [implode(".", array_slice($temp, 0, count($temp) - 1)), end($temp)];
    }else{
        $result[] = $temp;
    }
}

我正在使用array_slice内除最后一个元素之外的所有元素。
end我曾经获取过数组的最后一个元素。

Demo。

编辑1
实现相同目标的另一种方法，

$result    = [];
foreach ($temps as $row => $temp) {
    if (count($temp) > 2) {
        // except last elements
        $result[] = [implode(".", array_slice($temp, 0, -1)), end($temp)];
    }else{
        $result[] = $temp;
    }
}

Demo。

编辑2

$result    = [];
foreach ($temps as $row => $temp) {
    $result[] = (count($temp) > 2 ? [implode(".", array_slice($temp, 0, -1)), end($temp)] : $temp);
}

Demo。

编辑3

$result = array_map(function($temp){
    return (count($temp) > 2 ? [implode(".", array_slice($temp, 0, -1)), end($temp)] : $temp);
},$temps);

Demo。

编辑4 ：无条件

$result = array_map(function($temp){
    return [implode(".",array_slice($temp,0,-1)),array_pop($temp)];
},$temps);

编辑5

$result = array_map(function($temp){
    return [implode(".",array_slice($temp,0,-1)),end($temp)];
},$temps);

Demo。

输出：

Array
(
    [0] => Array
        (
            [0] => user.address.detail.name
            [1] => family
        )

    [1] => Array
        (
            [0] => user
            [1] => address
        )

    [2] => Array
        (
            [0] => user.address.detail
            [1] => name
        )

)

Answer 3

$data = [
    [
        'user',
        'address',
        'detail',
        'name',
        'family',
    ], [
        'user',
        'address',
    ], [
        'user',
        'address',
        'detail',
        'name',
        'family',
    ]
];

$result = array_map(function($item) {
    $last = array_pop($item);

    return [implode('.', $item), $last];
}, $data);

Answer 4

您可以在不使用两个foreach结构的情况下进行操作。例如：

$result = array_map(function (&$temp) {
  $last = array_pop($temp);
  $first = implode('.', $temp);

  return [$first, $last];
}, $temps);

如何压缩数组中的值？

4 个答案: