用数字php将字符串分成数组

Question

I have strings like 20160101 and 20170204, i want to divide them into array like

arr[0] = 2016;
arr[1] = 01;
arr[2] = 01;

Means first will be 4 character and other ones will be 2 and 2.I can split it if there any character that can be used for explode.So need help in this issue.

Answer 1

arr[0] = substr("20160101", 0, 4);
arr[1] = substr("20160101", 4, 2);
arr[2] = substr("20160101", 6, 2);