简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home > Backend Development > PHP Tutorial > body text

How to round floating point numbers using the round() function in PHP, round rounding_PHP tutorial

WBOY
Release： 2016-07-13 10:13:48
Original
1750 people have browsed it

The round() function in PHP rounds floating point numbers, round rounding

The example in this article describes how the round() function in PHP rounds floating-point numbers. Share it with everyone for your reference. The specific method is as follows:

Syntax: round(x,prec)

参数 描述
x 可选,规定要舍入的数字.
prec 可选,规定小数点后的位数.

Description: Returns the result of rounding x according to the specified precision prec (the number of digits after the decimal point). prec can also be a negative number or zero (default value).

Tips and Notes

Note: PHP cannot handle strings like "12,300.2" correctly by default.

Note: The prec parameter was introduced in PHP 4. The example code is as follows:

Copy code The code is as follows:
*/
echo round(3.4); //Output 3
echo "
";
echo round(3.5); //Output 4
echo "
";
echo round(3.6); //Output 4
echo "
";
echo round(3.6,0); //Output 4
echo "
";
echo round(1.95583,2); //Output 1.96
echo "
";
echo round(1241757,-3); //Output 1242000
echo "
";
echo round(4.045,2); //Output 4.05
echo "
";
echo round(4.055,2); //Output 4.06

//Use stdround function instead of php's round function
?>


Copy code The code is as follows:
function   stdround($num,   $d=0) 
{ 
      return   round($num   +   0.0001   /   pow(10,   $d),   $d); 
}   
        
echo   "round(1.005,2)= ".round(1.005,2). "n "; 
echo   "round(1.015,2)= ".round(1.015,2). "n "; 
echo   "round(1.025,2)= ".round(1.025,2). "n "; 
echo   "round(1.035,2)= ".round(1.035,2). "n "; 
echo   "round(1.045,2)= ".round(1.045,2). "n "; 
echo   "round(1.055,2)= ".round(1.055,2). "n "; 
echo   "round(1.065,2)= ".round(1.065,2). "n "; 
echo   "round(1.075,2)= ".round(1.075,2). "n "; 
echo   "round(1.085,2)= ".round(1.085,2). "n "; 
echo   "round(1.095,2)= ".round(1.095,2). "n ";
 
echo   "stdround(1.005,2)= ".stdround(1.005,2). "n "; 
echo   "stdround(1.015,2)= ".stdround(1.015,2). "n "; 
echo   "stdround(1.025,2)= ".stdround(1.025,2). "n "; 
echo   "stdround(1.035,2)= ".stdround(1.035,2). "n "; 
echo   "stdround(1.045,2)= ".stdround(1.045,2). "n "; 
echo   "stdround(1.055,2)= ".stdround(1.055,2). "n "; 
echo   "stdround(1.065,2)= ".stdround(1.065,2). "n "; 
echo   "stdround(1.075,2)= ".stdround(1.075,2). "n "; 
echo   "stdround(1.085,2)= ".stdround(1.085,2). "n "; 
echo   "stdround(1.095,2)= ".stdround(1.095,2). "n ";
 
$m=0.000000000000001; 
echo   "n "; 
echo   "round(1.005+{$m},2)= ".round(1.005+$m,2). "n "; 
echo   "round(1.015+{$m},2)= ".round(1.015+$m,2). "n "; 
echo   "round(1.025+{$m},2)= ".round(1.025+$m,2). "n "; 
echo   "round(1.035+{$m},2)= ".round(1.035+$m,2). "n "; 
echo   "round(1.045+{$m},2)= ".round(1.045+$m,2). "n "; 
echo   "round(1.055+{$m},2)= ".round(1.055+$m,2). "n "; 
echo   "round(1.065+{$m},2)= ".round(1.065+$m,2). "n "; 
echo   "round(1.075+{$m},2)= ".round(1.075+$m,2). "n "; 
echo   "round(1.085+{$m},2)= ".round(1.085+$m,2). "n "; 
echo   "round(1.095+{$m},2)= ".round(1.095+$m,2). "n ";
 
echo   "round(1.005,2)= ".round(1.005,2). "n "; 
echo   "round(1.015,2)= ".round(1.015,2). "n "; 
echo   "round(1.025,2)= ".round(1.025,2). "n "; 
echo   "round(1.035,2)= ".round(1.035,2). "n "; 
echo   "round(1.045,2)= ".round(1.045,2). "n "; 
echo   "round(1.055,2)= ".round(1.055,2). "n "; 
echo   "round(1.065,2)= ".round(1.065,2). "n "; 
echo   "round(1.075,2)= ".round(1.075,2). "n "; 
echo   "round(1.085,2)= ".round(1.085,2). "n "; 
echo   "round(1.095,2)= ".round(1.095,2). "n ";
?>

希望本文所述对大家的PHP程序设计有所帮助。

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/914047.htmlTechArticlePHP中round()函数对浮点数进行四舍五入的方法，round四舍五入 本文实例讲述了PHP中round()函数对浮点数进行四舍五入的方法。分享给大家供大...
Related labels：
php round function
source：php.cn
Previous article：Configure php.ini to implement PHP file upload function, _PHP tutorial Next article：FTP operation class---copy, move, delete files/create directories, ftp---_PHP tutorial
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PHP arrays obtained from URL parameters do not behave as expected I have a URL parameter that contains the category ID and I want to treat it as an array li...
From 2024-04-06 22:09:02
0
1
1428
Where should I place CustomLog directive in apache I'm using php:7.2-apachedocker. I need to disable health check url login access log. Based...
From 2024-04-06 22:03:59
0
1
990
What is the format of the variables in the return value? I am a new learner of php. I found a piece of code: if($x<time()){return[false,'error']...
From 2024-04-06 21:55:20
0
1
778
Problems encountered when using opentbs to generate odt files: values ​​of the same key are displayed in the same row instead of separate columns. I'm using a library called OpenTbs to create odt using PHP, I'm using it because columns a...
From 2024-04-06 20:18:18
0
1
483
Group MySQL results by ID for looping over I have a table with flight data in mysql. I'm writing a php code that will group and displ...
From 2024-04-06 17:27:56
0
1
406
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！