PHP Rounding Accurate decimal places and rounding

This article will use PHP to round up the numbers to keep n decimal digits, as well as using PHP for the number of rounding method to do a small sum.

(1) PHP retains three decimal places and rounded

The code is as follows	Copy Code
$num = 0.0215489; Echo sprintf ("%.3f", $num); 0.022

(2) PHP keep three decimal digits not rounded

The code is as follows	Copy Code
$num = 0.0215489; Echo substr (sprintf ("%.4f", $num), 0,-1); 0.021

(3) php into a method to take an integer (this in the paging program in the number of pages in the program will be used)

The code is as follows	Copy Code
echo ceil (4.3); 5 echo ceil (9.999); 10

(4) The method of the PHP house to take the integer

The code is as follows	Copy Code
echo floor (4.3); 4 echo Floor (9.999); 9

(5), round function

Example 1. Round () example

code is as follows	copy code
<?php Echo Round (3.4);        //3 Echo round (3.5);         //4 Echo round (3.6);        //4 Echo Round (3.6, 0);     //4 Echo round (1.95583, 2); //1.96 Echo round (1241757,- 3); 1242000 Echo Round (5.045, 2);   //5.05 Echo round (5.055, 2);   //5.06 ? &G t;