PHP scientific notation conversion to normal numerical output solution

Go directly to the code

/**
 * @param $num         科学计数法字符串  如 2.1E-5
 * @param int $double 小数点保留位数 默认5位
 * @return string
 */

function sctonum($num, $double = 5){
    if(false !== stripos($num, "e")){
        $a = explode("e",strtolower($num));
        return bcmul($a[0], bcpow(10, $a[1], $double), $double);
    }
}

echo sctonum(2.1E-5, 6); //输出0.000021

The above introduces the PHP scientific notation method to convert normal numerical output solution, including aspects of the content, I hope it will be helpful to friends who are interested in PHP tutorials.