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# Largest Series Product
Given a string of digits, calculate the largest product for a contiguous
substring of digits of length n.
For example, for the input `'1027839564'`, the largest product for a
series of 3 digits is 270 (9 * 5 * 6), and the largest product for a
series of 5 digits is 7560 (7 * 8 * 3 * 9 * 5).
Note that these series are only required to occupy *adjacent positions*
in the input; the digits need not be *numerically consecutive*.
For the input `'73167176531330624919225119674426574742355349194934'`,
the largest product for a series of 6 digits is 23520.
## Making the Test Suite Pass
1. Get [PHPUnit].
% wget --no-check-certificate https://phar.phpunit.de/phpunit.phar
% chmod +x phpunit.phar
2. Execute the tests for an assignment.
% phpunit.phar wordy/wordy_test.php
[PHPUnit]: http://phpunit.de
## Source
A variation on Problem 8 at Project Euler [http://projecteuler.net/problem=8](http://projecteuler.net/problem=8)
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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