Isogram

Welcome to Isogram on Exercism's PHP Track. If you need help running the tests or submitting your code, check out HELP.md.

Instructions

Determine if a word or phrase is an isogram.

An isogram (also known as a "nonpattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.

Examples of isograms:

lumberjacks
background
downstream
six-year-old

The word isograms, however, is not an isogram, because the s repeats.

Source

Created by

@ecrmnn

Contributed to by

@arueckauer
@kunicmarko20
@kytrinyx
@petemcfarlane

Based on

Wikipedia - https://en.wikipedia.org/wiki/Isogram

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