PHP Taskbook Level 3.7

Given a string of words, sort the words in alphabetical order.

Given a number, get an array of divisors of that number.

Given two numbers, get an array of common divisors of these numbers.

Given a number, check that this number has only one divisor other than itself and one.

The numbers are written separated by commas. Get the maximum of these numbers.

Given an array of numbers, insert another one of the same after each single-digit number.

Given a string, remove all vowels from it.

Given a string, capitalize the last letter of each word in this string.