如何有效地插入一个PHP数组陆续已知元素（通过按键或指针）的元素？ [英] How to efficiently insert elements after another known (by key or pointer) element in a PHP array?

问题描述

给定一个数组：

$a = array(
    'abc',
    123,
    'k1'=>'v1',
    'k2'=>'v2',
    78,
    'tt',
    'k3'=>'v3'
);

随着它的要素之一其内部指针，我如何在当前元素之后插入一个元素？
而且我怎么插入一个关键知名的元素之后的元素，说'K1'？

With its internal pointer on one of its elements, how do I insert an element after the current element? And how do I insert an element after a key-known element, say 'k1'?

业绩护理〜

推荐答案

您可以通过使用分割阵列做 array_keys 和 array_values​​ ，然后拼接他们两个，然后再次将它们结合起来。

You could do it by splitting your array using array_keys and array_values, then splice them both, then combine them again.

$insertKey = 'k1';

$keys = array_keys($arr);
$vals = array_values($arr);

$insertAfter = array_search($insertKey, $keys) + 1;

$keys2 = array_splice($keys, $insertAfter);
$vals2 = array_splice($vals, $insertAfter);

$keys[] = "myNewKey";
$vals[] = "myNewValue";

$newArray = array_merge(array_combine($keys, $vals), array_combine($keys2, $vals2));

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