Get the Fibonacci sequence up to a maximum value

get_fibonacci_sequence_up_to_a_maximum_value.php

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