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Language/Type: PHP arrays

Write a function named remove_consecutive_duplicates that accepts as a parameter an array of numbers, and modifies it by removing any consecutive duplicates.

For example, if an array named $arr stores [1, 2, 2, 3, 2, 2, 3], the call of remove_consecutive_duplicates($arr) should modify it to store [1, 2, 3, 2, 3].

You may assume that the array passed is non-null, but it may be empty (in which case it would trivially contain no duplicates and should be left unchanged).

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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