PHP-将项目添加到关联数组的开头 [英] PHP - add item to beginning of associative array

问题描述

如何将一个项目添加到关联数组的开头?例如，假设我有一个像这样的数组:

How can I add an item to the beginning of an associative array? For example, say I have an array like this:

$arr = array('key1' => 'value1', 'key2' => 'value2');

当我在$arr['key0'] = 'value0';中添加一些内容时，我得到:

When I add something to it as in $arr['key0'] = 'value0';, I get:

Array
(
    [key1] => value1
    [key2] => value2
    [key0] => value0
)

我该如何做到

Array
(
    [key0] => value0
    [key1] => value1
    [key2] => value2
)

谢谢，
三通

推荐答案

您可以使用 union 运算符:

You could use the union operator:

$arr1 = array('key0' => 'value0') + $arr1;

或 array_merge .

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