What are the methods to achieve rounding in php

Method: 1. Use number_format(), the syntax is "number_format($num, decimal places, '.', '')"; 2. Use round(), the syntax is "round($num, decimal place) number of digits)"; 3. Use the sprintf() function to format the output to achieve rounding.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Under PHP development , sometimes we encounter the situation of rounding data. Below we share three methods of rounding data using PHP. Rounding is achieved through the number_format() function, round() function and sprintf() formatted output method.

1. The number_format() method implements rounding

The number_format() function formats numbers by grouping thousands.

<?php
 
//定义一个float型的变量
$number = 1234.5678;
 
//English Notation (defult)
$number_format_english = number_format($number);
//1,235
$number_format_english = number_format($number, 2, &#39;.&#39;, &#39;&#39;);
//1234.57
 
//French Notation
$number_format_francais = number_format($number, 2, &#39;,&#39;, &#39;&#39;);
//1234,57
$number_format_francais = number_format($number, 3, &#39;,&#39;, &#39;&#39;);
//1234,568
 
echo $number_format_english;
//1234.57
echo $number_format_francais;
//1234,568

2. The round() method implements rounding

The round() function rounds floating-point numbers.

<?php
 
//定义一个float型的变量
$number = 1234.5678;
 
//不保留小数
echo round($number);
//1235
 
//保留两位小数
echo round($number,2);
//1234.57
 
echo "<br>";
 
$number = 12345678;
 
//在千分位进行四舍五入
echo round($number,-4);
//12350000

3, sprintf() formatted output to achieve rounding

String formatting command, the main function is Write formatted data into a string. sprintf is a variadic function.

<?php
 
//定义一个正整数
$n =  43951789;
 
//定义一个负整数
$u = -43951789;
 
// ASCII 65 is &#39;A&#39;
$c = 65; 
 
printf("%%b = &#39;%b&#39;\n", $n); 
//%b = &#39;10100111101010011010101101&#39;
printf("%%c = &#39;%c&#39;\n", $c); 
//%c = &#39;A&#39; 
printf("%%d = &#39;%d&#39;\n", $n); 
//%d = &#39;43951789&#39; 
printf("%%e = &#39;%e&#39;\n", $n); 
//%e = &#39;4.395179e+7&#39; 
printf("%%u = &#39;%u&#39;\n", $n); 
//%u = &#39;43951789&#39; 
printf("%%u = &#39;%u&#39;\n", $u); 
//%u = &#39;4251015507&#39; 
printf("%%f = &#39;%f&#39;\n", $n); 
//%f = &#39;43951789.000000&#39; 
printf("%%o = &#39;%o&#39;\n", $n); 
//%o = &#39;247523255&#39; 
printf("%%s = &#39;%s&#39;\n", $n); 
//%s = &#39;43951789&#39; 
printf("%%x = &#39;%x&#39;\n", $n); 
//%x = &#39;29ea6ad&#39; 
printf("%%X = &#39;%X&#39;\n", $n); 
//%X = &#39;29EA6AD&#39; 
printf("%%+d = &#39;%+d&#39;\n", $n); 
//%+d = &#39;+43951789&#39; 
printf("%%+d = &#39;%+d&#39;\n", $u); 
//%+d = &#39;-43951789&#39;

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