A PHP function for the Fibonacci sequence

I was recently asked as a test to write a function that outputs the Fibonacci sequence in PHP. Here it is:

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<?php function fib() {     $current = 1;     $previous = 0;     $evaluation = 0;     while($evaluation < 100) {         $evaluation = ($current+$previous);         $current = $previous;         $previous = $evaluation;         echo $evaluation . '<br>';     } } echo fib(); ?>