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Language/Type: PHP arrays

Write a function named cumulative that accepts as a parameter an array of numbers, and modifies it so that each element contains the cumulative sum of the elements up through that index. For example, if the array passed contains [1, 1, 2.5, 3, 5], your function should modify it to store [1, 2, 4.5, 7.5, 12.5].

You may assume the array passed is non-null and contains only number values.

A note about references in PHP: In order to write a function passes a parameter as reference (thus modifying its state), you'll need to prepend "&" to the variable declaration in the function header. For example, a function foo that modifies the state of an array parameter may be defined as:

function foo(&$arr) { ... }
Function: Write a PHP function as described, not a complete program.

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