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@ 2014-03-06T15:07:02Z

<?php

function getCoefAtAmericanFormat($coef)
    {
        if ($coef == '' || $coef  == 0)
        {
            return 0;
        }

        return $coef == 2 ? "+100" : $coef < 2 ? '-' . floor((100 / (round($coef,2) - 1))) : '+' . floor(((round($coef,2) - 1) * 100));
    }

echo getCoefAtAmericanFormat(1.04);

Output
Performance
VLD
References
Branches

round: documentation ( source)
floor: documentation ( source)

preferences:dark modelive preview

37.96 ms | 402 KiB | 5 Q