Get the Fibonacci sequence

get_fibonacci_sequence.php

<?php
function fibonacci_sequence($limit=0)
{
    $limit = abs(intval($limit));
    $sequence = array();
    $count = 0;
    while($count < $limit)
    {
        $a = isset($sequence[$count-2]) ? $sequence[$count-2] : 0;
        $b = isset($sequence[$count-1]) ? $sequence[$count-1] : 1;
        $sequence[] = $a + $b;
        ++$count;
    }
    return $sequence;
}
?>