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数组拼接“剪切粘贴”元素

php

0

Robert Sinclair · 技术社区 · 6 年前

我有一个数组:

Array
(
    [0] => Array
        (
            [field_id] => 1
            [field_name] => NO_INSCRIPTION
            [order_number] => 0
        )

    [1] => Array
        (
            [field_id] => 2
            [field_name] => NO_ADDENDA
            [order_number] => 1
        )

    [2] => Array
        (
            [field_id] => 3
            [field_name] => CODE_LANGUE
            [order_number] => 2
        )

    [3] => ARRAY
        (
            [field_id] => 7
            [field_name] => TEXTE
            [order_number] => 3
        )
)

我想移动第四个元素到第二个位置

Array
(
    [0] => Array
        (
            [field_id] => 1
            [field_name] => NO_INSCRIPTION
            [order_number] => 0
        )

    [1] => ARRAY
        (
            [field_id] => 7
            [field_name] => TEXTE
            [order_number] => 3
        )

    [2] => Array
        (
            [field_id] => 2
            [field_name] => NO_ADDENDA
            [order_number] => 1
        )

    [3] => Array
        (
            [field_id] => 3
            [field_name] => CODE_LANGUE
            [order_number] => 2
        )

)

我试过了 array_splice 使用相同的函数

array_splice($arr, 1, 0, $arr[3]);

但是它返回了一些奇怪的东西而且它还保留了第三个元素的副本

我知道这可以用 array_slice 但也许有一种更优雅、更易读的方式来实现这一点呢?希望有一个一行内置的PHP函数。

4 回复 | 直到 6 年前

1

4

Robert Sinclair 6 年前

不要一行一行地这么做。将所需元件拼接出来,然后将其重新拼接到所需位置:

$extracted = array_splice($arr, 3, 1);
array_splice($arr, 1, 0, $extracted[0]);

当生成的代码干净且易于理解时,一行程序是很好的,但是有一个类似于 array_splice() 当数组被修改到适当的位置时,结果可能很难让人理解。如果您真的想要一个一行程序,那么这就是函数的用途:

function moveArrayElement(&$array, $from, $to) {
    $extracted = array_splice($array, $from, 1);
    array_splice($array, $to, 0, $extracted);
}

moveArrayElement($arr, 3, 1);

2

3

Nick SamSmith1986 6 年前

您可以将两个调用合并到 array_splice ,第一个提取要移动的值,第二个重新插入该值。这利用了一个事实 阵列拼接 就地修改数组并返回提取的值:

$from = 3;
$to = 1;
array_splice($arr, $to, 0, array_splice($arr, $from, 1));

输出:

Array
(
    [0] => Array
        (
            [field_id] => 1
            [field_name] => NO_INSCRIPTION
            [order_number] => 0
        )    
    [1] => Array
        (
            [field_id] => 7
            [field_name] => TEXTE
            [order_number] => 3
        )    
    [2] => Array
        (
            [field_id] => 2
            [field_name] => NO_ADDENDA
            [order_number] => 1
        )    
    [3] => Array
        (
            [field_id] => 3
            [field_name] => CODE_LANGUE
            [order_number] => 2
        )    
)

Demo on 3v4l.org

3

0

gview 6 年前

有许多不同的排序功能。在你的情况下你想看看 natcasesort()

<?php
$r = ['a', 'c', 'B', 'd'];

natcasesort($r);

print_r($r);

输出

Array
(
    [0] => a
    [2] => B
    [1] => c
    [3] => d
)

4

0

Joseph 6 年前

你可以用 array_sort 在这种情况下可能是最好的

$base = [
    0 => "a",
    1 =>  "c",
    2 =>  "d",
    3 =>  "b"
];

$replacement = [1 => $base[3], 3 => $base[1]];
$res = array_replace($base, $replacement);

print_r($res);

结果会是这样

Array ( [0] => a [1] => b [2] => d [3] => c )