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Language/Type: PHP string
Write a function named is_all_vowels that returns whether a string consists entirely of vowels (a, e, i, o, or u, case-insensitively). For example, is_all_vowels("eiEIo") should return true while is_all_vowels("banana") should return false. For this problem, you may assume that a working solution already exists to the previous problem, is_vowel, and you may call it in your solution.
Function: Write a PHP function as described, not a complete program.

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