PHP数组next（）和preV（） [英] php arrays next() and prev()

问题描述

我有一个数组，看起来像这样，

I have an array that looks like this,

    Array
(
    [0] => 849710414
    [1] => 849710726
    [2] => 849710744
    [3] => 849712728
    [4] => 849713005
    [5] => 849713439
    [6] => 849714856
    [7] => 849714924
    [8] => 849716371
    [9] => 849716441
    [10] => 849717118
    [11] => 849719043
    [12] => 849719187
    [13] => 849722865
    [14] => 849723412
    [15] => 849723777
    [16] => 849725052
    [17] => 849726294
    [18] => 849726457
    [19] => 849726902
    [20] => 849728239
    [21] => 849728372
    [22] => 849728449
    [23] => 849730353
    [24] => 849733625
)

这些ID的，我需要添加到URL来浏览这个网站四周，ID是获取用户的搜索返回的结果，然后用户点击搜索结果并具有去到下一个选项搜索结果是看previous之一，现在我虽然我能做到这一点，做

These are ID's that I need to add to an URL to navigate around the site, the IDs are the results that get returned from a user's search, the user then clicks on a search result and has the option of going to the next search result are look at the previous one, now I though I would be able to do this, by doing

<a href="<?=next($array);?>">Next</a>
<a href="<?=prev($array);?>">Prev</a>

我似乎永远那么不承认我在看当前结果ID是什么工作，什么是下一个和previous？有谁现在我怎么能解决这个问题？

How ever I does not seem to recognise what the current result ID I am looking at is to work what is next and previous? Does anybody now how I can solve this?

推荐答案

下一个（） 和 preV（ ） 处理，而你的脚本数组的内部指针正在处理中。

next() and prev() deal with the internal pointer of the array while your script is processing.

你需要做的是找出当前正在查看数组的索引（ array_search（） ），然后加1获得下一个值，减去1获得previous值。

What you need to do is find out which index of the array you are currently viewing, (array_search()) then add 1 to get the next value, and subtract 1 to get the previous value.

// Find the index of the current item
$current_index = array_search($current_id, $array);

// Find the index of the next/prev items
$next = $current_index + 1;
$prev = $current_index - 1;

您的HTML：

<?php if ($prev > 0): ?>
    <a href="<?= $array[$prev] ?>">Previous</a>
<?php endif; ?>

<?php if ($next < count($array)): ?>
    <a href="<?= $array[$next] ?>">Next</a>
<?php endif; ?>

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