How does the sprintf() function in php implement price formatting?

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Summary: In different business scenarios, the implementation logic is also different. Generally, use method 2
Method 1

<?php/**
 * User: Jack
 * Date: 2017/11/27
 * Time: 19:43
 */
 header(&#39;Content-Type:text/html;Charset=utf-8&#39;);
 $a = 155.8888;
 if (getFloatLength($a) > 2) {    
 echo formatNum($a,2);
}
//格式化function formatNum($input, $num){
    return sprintf("%." . $num . "f", $input);
}
//计算小数点后面的位数function getFloatLength($num){
    $count = 0;    
    $temp = explode(&#39;.&#39;, $num);    
    if (sizeof($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));
}

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