PHP得到一个数组的最后3个元素 [英] PHP get the last 3 elements of an array

问题描述

我有一个数组：

  [13] =＆GT;排列
        （
            [0] =＆GT;乔
            [1] =＆GT; 0    [14] =＆GT;排列
        （
            [0] =＆GT;短发
            [1] =＆GT; 0
        ）    [15] =＆GT;排列
        （
            [0] =＆GT;起诉
            [1] =＆GT; 0
        ）    [16] =＆GT;排列
        （
            [0] =＆GT;约翰
            [1] =＆GT; 0
        ）    [17] =＆GT;排列
        （
            [0] =＆GT;掠夺
            [1] =＆GT; 0
        ）    [18] =＆GT;排列
        （
            [0] =＆GT;拉里
            [1] =＆GT; 0
        ）
 

我怎样才能获得最后3个元素，而preserving的钥匙？ （数组中元素的个数可能会有所不同，所以我不能在第二个元素后，只需快讯）

所以输出将是：

  [16] =＆GT;排列
        （
            [0] =＆GT;约翰
            [1] =＆GT; 0
        ）    [17] =＆GT;排列
        （
            [0] =＆GT;掠夺
            [1] =＆GT; 0
        ）    [18] =＆GT;排列
        （
            [0] =＆GT;拉里
            [1] =＆GT; 0
        ）
 

解决方案

如果您想preserve键，可以在真正的传递作为第四个参数：

  array_slice（$ A，-3，3，真实）;
 

I have an array:

[13] => Array
        (
            [0] => joe
            [1] => 0

    [14] => Array
        (
            [0] => bob
            [1] => 0
        )

    [15] => Array
        (
            [0] => sue
            [1] => 0
        )

    [16] => Array
        (
            [0] => john
            [1] => 0
        )

    [17] => Array
        (
            [0] => harry
            [1] => 0
        )

    [18] => Array
        (
            [0] => larry
            [1] => 0
        )

How can I get the last 3 elements while preserving the keys? (the number of elements in the array may vary, so I cannot simply slice after the 2nd element)

So the output would be:

  [16] => Array
        (
            [0] => john
            [1] => 0
        )

    [17] => Array
        (
            [0] => harry
            [1] => 0
        )

    [18] => Array
        (
            [0] => larry
            [1] => 0
        )

解决方案

If you want to preserve key, you can pass in true as the fourth argument:

array_slice($a, -3, 3, true);

这篇关于PHP得到一个数组的最后3个元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！