How the sprintf () function in PHP implements price formatting

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Summary: Different business scenarios, the implementation of logic is also different, in general, the use of Method 2
Method 1

<?php/** * User:jack * DATE:2017/11/27 * time:19:43 * * Header (' content-type:text/html; Charset=utf-8 '); $a = 155.8888; if (getfloatlength ($a) > 2) {     echo formatnum ($a, 2);} Format Function Formatnum ($input, $num) {    return sprintf ("%.". $num. "F", $input);} Calculates the number of digits after the decimal point function getfloatlength ($num) {    $count = 0;        $temp = Explode ('. ', $num);        if (sizeof ($temp) > 1) {            $decimal = end ($temp);            $count = strlen ($decimal);    }        return $count;}

Method 2

function Formatitemprice ($price, $num = 2) {    $str = sprintf ("%.". $num. "F", $price);        Return Strval (Floatval ($STR));}