将字符串拆分为数组并更改密钥名称

I'm trying to split a string into an array where I can set the keyname instead of 1 2 3.

Here's the string:

"id=1&day=4&month=12&status=3"

The string can be just the ID, the ID and day, or all 4 together.

I want it to be like this:

array([id] => 1 [day] =>4...) 

Use parse_str():

parse_str("id=1&day=4&month=12&status=3", $parts);
var_export($parts);

Demo