PHP Rounding Accurate decimal place and rounding _php tutorial

Source: Internet
Author: User
PHP to take the decimal place function has sprintf,ceil,floor,round and so on functions to achieve rounding, let's look at the specific example.

This article will use PHP to round up numbers to preserve n decimal places, and a small summary of how numbers are rounded using PHP.

(1) PHP reserved Three decimal places and rounded

The code is as follows Copy Code

$num = 0.0215489;
Echo sprintf ("%.3f", $num); 0.022


(2) PHP reserved Three decimal places 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 is used in the page of the pager program)

The code is as follows Copy Code

echo ceil (4.3); 5
echo ceil (9.999); 10


(4) PHP to take an 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

The code is as follows Copy Code

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
?>

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