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Language/Type: PHP Queue collections

Write a function named stutter that accepts an array queue of integers as a parameter and replaces every element with two copies of itself.

For example, if an array queue named $q stores [1, 2, 3], the call of stutter(q); should change it to store [1, 1, 2, 2, 3, 3].

Constraints: Do not use any auxiliary collections as storage.

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

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