- round: documentation ( source)
<?php
function getCoefAtAmericanFormat($coef)
{
if ($coef == '' || $coef == 0)
{
return 0;
}
return $coef == 2 ? "+100" : $coef < 2 ? '-' . round(100 / ($coef - 1)) : '+' . round((($coef - 1) * 100));
}
echo getCoefAtAmericanFormat(1.04);