PHP Rounding Accurate decimal place and rounding _php tutorial

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

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

(2) PHP reserved Three decimal places not rounded

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$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)

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

(4) PHP to take an integer

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echo floor (4.3); 4 echo Floor (9.999); 9

(5), round function

Example 1. Round () example

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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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