The use of rounding round rounding, rounding up, rounding down, and fractional interception in PHP Division operations

Source: Internet
Author: User
This article mainly introduces the PHP division operations rounded rounding, up rounding, down rounding, the use of fractional interception, has a certain reference value, now share to everyone, there is a need for friends can refer to

PHP takes integer functions commonly used in four ways:
1. Direct rounding, discarding decimals, preserving integers: intval ();
2 Rounding and Rounding: round ();
3. Rounding up, there are decimals on the addition of 1:ceil ();
4. Rounding Down: Floor ().

First, intval-the variable into an integer form
Intval If the character type is automatically converted to 0, it is usually used to cast a numeric type, but it is important to note that it is recommended to use (int) if the length is too long.

Intval (5.2);  5intval (5.6);  5intval (' abc '); 0

Second, rounding: round ()
The parameter 1 is rounded according to the specified precision of parameter 2. The parameter 2 can be a negative number or 0 (the default).

Round (5.2);      5round (5.8);      6round (5.88888, 0);   6round (5.83333, 2);   5.83round (5.83353, 3);   5.834round (5201314,-2);  5201300

Three, upward rounding, there are decimals on the addition of 1:ceil ()

Echo (Ceil (0.60);   1echo (Ceil (0.40);   1echo (Ceil (5);      5echo (Ceil (5.1);    6echo (Ceil ( -5.1);   -5echo (Ceil ( -5.9));  -5

Four, downward rounding: Floor ()

echo (Floor (0.60));  0echo (Floor (0.40));     0echo (Floor (5));   5echo (Floor (5.1));  5echo (Floor (-5.1)); -6echo (Floor ( -5.9))//-6 

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