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Author: Melissa Hovik (on 2018/01/05)

Write a function named find_max that accepts an array of numbers as a parameter and returns the maximum value in the array.

For example, if an array named $arr stores [17, 7, -1, 26, 3, 9], the call of find_max($arr) should return 26. You may assume that the array contains at least one element.

Function: Write a PHP function as described, not a complete program.

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