PHP实现斐波那契数列

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<?php
// fib.php  
function fib($n)
{
    $cur = 1;
    $prev = 0;
    for ($i = 0; $i < $n; $i++) 
    {
        yield $cur;

        $temp = $cur;
        $cur = $prev + $cur;
        $prev = $temp;
    }
}

$fibs = fib(19);
foreach ($fibs as $fib) {
    echo " " . $fib;
}

# php fib.php