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Language/Type: PHP collections Queue Stack

Write a function named mirror that accepts an array queue of strings as a parameter and appends the queue's contents to itself in reverse order. For example, if an array queue named $q stores ["a", "b", "c"], the call of mirror($q); should change it to store ["a", "b", "c", "c", "b", "a"].

Constraints: You may declare a single array as auxiliary storage.

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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