Benchmark for PHP vs HHVM

fibonacci.php

<?php

$start = microtime(true);

$first = 0;
$second = 1;
$n = 10000000;

for($i=1;$i<=$n-1;$i++)
{
   $final = $first + $second;
   $first = $second;
   $second = $final;
}

echo 'it took ' . (microtime(true) - $start) . ' second(s) to calculate ' . $n . ' digit of fibonacci' . PHP_EOL;