按索引偶数或奇数将数组拆分为两个数组 [英] Split array into two arrays by index even or odd

问题描述

我有这个数组:

$array = array(a, b, c, d, e, f, g);

我想根据索引是偶数还是奇数将其拆分为两个数组，如下所示:

I want to split it in two arrays depending if the index is even or odd, like this:

$odd = array(a, c, e, g);

$even = array(b, d, f);

提前致谢！

推荐答案

一种解决方案，使用匿名函数和 array_walk:

One solution, using anonymous functions and array_walk:

$odd = array();
$even = array();
$both = array(&$even, &$odd);
array_walk($array, function($v, $k) use ($both) { $both[$k % 2][] = $v; });

这只是在数组上的一次传递中将项目分开，但这有点聪明"的一面.真的不比经典好，更啰嗦

This separates the items in just one pass over the array, but it's a bit on the "cleverish" side. It's not really any better than the classic, more verbose

$odd = array();
$even = array();
foreach ($array as $k => $v) {
    if ($k % 2 == 0) {
        $even[] = $v;
    }
    else {
        $odd[] = $v;
    }
}

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