详解PHP中2个float的比较

时间：2016-2-29 已查看2199次

//等于比较

function floatcmp($f1,$f2,$precision = 10) {// are 2 floats equal

    $e = pow(10,$precision);

    $i1 = intval($f1 * $e);

    $i2 = intval($f2 * $e);

    return ($i1 == $i2);

}

//大于比较

function floatgtr($big,$small,$precision = 10) {// is one float bigger than another

    $e = pow(10,$precision);

    $ibig = intval($big * $e);

    $ismall = intval($small * $e);

    return ($ibig > $ismall);

}

//大于等于比较

function floatgtre($big,$small,$precision = 10) {// is on float bigger or equal to another

    $e = pow(10,$precision);

    $ibig = intval($big * $e);

    $ismall = intval($small * $e);

    return ($ibig >= $ismall);

}