Series in PHP
Given a string of digits, output all the contiguous substrings of length `n` in that string.
exercism fetch php series
Given a string of digits, output all the contiguous substrings of length
For example, the string "49142" has the following 3-digit series:
And the following 4-digit series:
And if you ask for a 6-digit series from a 5-digit string, you deserve whatever you get.
Note that these series are only required to occupy adjacent positions in the input; the digits need not be numerically consecutive.