我有这个数组：
Array
(
[15] => 13.1
[16] => Mark one answer
[19] => You see a car on the hard shoulder of a motorway with a HELP pennant displayed. This means the driver is most likely to be
[20] => a disabled person first aid trained
[21] => a foreign visitor
[22] => a rescue patrol person
[25] => DES s15, HC r278);
如何从0对键进行排序？ 得到这个：我知道有一个功能，但我的头被烧了，排序功能不适合我的需要，因为他们重新排列值，我需要它们保存。
Array
(
[0] => 13.1
[1] => Mark one answer
[2] => You see a car on the hard shoulder of a motorway with a HELP pennant displayed. This means the driver is most likely to be
[3] => a disabled person first aid trained
[4] => a foreign visitor
[5] => a rescue patrol person
[6] => DES s15, HC r278);