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Language/Type: PHP arrays
Author: Eric Roberts (on 2018/01/05)

Write a function named find_mean that accepts an array of numbers as a parameter and returns the arithmetic mean (average) of the numbers in the array.

For example, if the array passed contains [2, 4.5, 6.5, 1], your function should return 3.5. If it instead contained [2, 2, 2] it should return 2.

If the array is empty, your function should return 0.

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

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