The precise decimal position of the PHP rounding and the method to take the whole

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

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

(2) PHP keep three decimal digits not rounded

$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)

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

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

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

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