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@ 2016-02-23T21:14:57Z

<?php

function echoFibonacciNumber(int $input)
{
    if ($input < 0) {
        echo "Invalid input";
    }
    if ($input === 0 || $input === 1) {
        $output = $input;
    } else {
        $fi = (sqrt(5) + 1) / 2;
        $output = floor(pow($fi, $input) / sqrt(5) + 1 / 2);
    }

    echo 'input: '.$input.', output: '.$output;
}

echo echoFibonacciNumber(6);

Output
Performance
VLD
References
Branches

floor: documentation ( source)
pow: documentation ( source)
sqrt: documentation ( source)

preferences:dark modelive preview

22.79 ms | 406 KiB | 5 Q