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Language/Type: PHP arrays traversals

Write a function named find_range that accepts an array of integers as a parameter and returns the range of values contained in the array. The range of a collection of numbers is equal to one more than the difference between the largest and smallest element.

For example, if the largest element is 17 and the smallest is 6, the range is 12. If the largest and smallest values are the same, the range is 1. You may assume that the array passed contains at least one element.

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

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