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Language/Type: PHP arrays

Write a function named repeat that accepts an array of elements and an integer $k as parameters and that replaces each element with $k copies of that element.

For example, if an array stores the values ["how", "are", "you?"] before the function is called and $k is 4, it should store the values ["how", "how", "how", "how", "are", "are", "are", "are", "you?", "you?", "you?", "you?"] after the function finishes executing. If the array instead stored [143, 154] with the same $k, it should then store the values [143, 143, 143, 143, 154, 154, 154, 154] after the function finishes executing (in other words, the same behavior is expected regardless of what type of elements the array contains).

If $k is 0 or negative, the array should be empty after the call. You may assume that the array passed is non-null.

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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