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Language/Type: PHP loops parameters return

Write a function named sum_of_digits that accepts an integer parameter and computes and returns the sum of all the digits of that number.

For example, sum_of_digits(38015) should return 17 (since 3 + 8 + 1 + 0 + 5 = 17). For negative numbers, return the same value as if the number were positive. For example, sum_of_digits(-72) returns 9 (since 7 + 2 = 9).

You may assume that the value passed is an Integer type.

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

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