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Language/Type: PHP arrays stutter

Write a function stutter that takes an array of elements as a parameter and that replaces every element with two of occurrences of that element.

For example, if an array stores the values ["how", "are", "you?"] before the function is called, it should store the values ["how", "how", "are", "are", "you?", "you?"] after the function finishes executing.

If the array instead stored [0, 0, 1], it should store the values [0, 0, 0, 0, 1, 1] after the function finishes executing.

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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