PHP rounding to exact decimal places and rounding

Source: Internet
Author: User

In php, functions such as sprintf, ceil, floor, and round are used to perform rounding. Let's take a look at the specific instance.

This article will use php to round the number and retain N decimal places, and use php to round the number.

(1) php keeps three decimal places and rounding them

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


(2) php keeps three decimal places not rounded.

 

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$ Num = 0.0215489;
Echo substr (sprintf ("%. 4f", $ num), 0,-1); // 0.021


(3) php goes one way to get an integer (this will be used in the paging program's page number Program)

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Echo ceil (4.3); // 5
Echo ceil (9.999); // 10


(4) php rounding method to get an integer

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Echo floor (4.3); // 4
Echo floor (9.999); // 9

(5), round function

Example 1. round ()

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<? 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
?>

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