PHP Unset Array 值对其他索引的影响

问题描述

我正在使用 PHP 循环，我有一个关于未设置如何影响数组键的问题.这个数组使用 PHP 指定的标准数字键，0, 1, 2, 3 etc....每当 unset() 在数组值上运行时，数组键是被打乱还是像以前一样维护?

I am working with a PHP loop, and I had one question regarding how unset affects the array keys. This array uses the standard numeric keys assigned by PHP, 0, 1, 2, 3 etc.... Whenever unset() runs on an array value, are the array keys shuffled or are they maintained as before?

感谢您的宝贵时间.

推荐答案

键不会被重新排列或重新编号.unset() 键被简单地删除，其他键保持不变.

The keys are not shuffled or renumbered. The unset() key is simply removed and the others remain.

$a = array(1,2,3,4,5);
unset($a[2]);
print_r($a);

Array
(
    [0] => 1
    [1] => 2
    [3] => 4
    [4] => 5
)

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