Difference of array elements

Question

PHP

Good afternoon!
I have a question that I can't find an answer to.
So, there is a list of numbers, their number is not predetermined.
It is necessary to find out if there are at least three numbers in this list, the difference between which does not exceed a predetermined value.
So the question is how can this be done.
Thank you for your attention!

Answer 1

Sort, then sequentially look at the array for a match to the condition. If it is necessary that the total difference between the numbers does not exceed the specified value, then do a cycle from 0 to n-2, in which to compare a[i] ca[i+2]. With a[i-2]-a[i] <= m, return True, after the loop — False. (n is the number of the last array element (array size), m is a given number that must not be exceeded, i is a counter).
Implement, I hope, will not be difficult?