PHP rounding Function: ceil,floor,round,intval the difference in detail _php tips

We often use PHP to take the whole function, mainly: Ceil,floor,round,intval.

Ceil--a method for rounding
Description
float ceil (float value)

Returns the next integer that is not less than value, or the value if there is a decimal part. The type returned by Ceil () is still float, because the float value is usually larger than the integer.

PHP takes an integer function Example 1. Ceil () example

Copy Code code as follows:

< php echo ceil (4.3);
5 echo ceil (9.999);
10
?>

Floor--the method of rounding out
description
Float floor (float value)

Returns the next integer not more than value, rounding out the decimal part of value. The type returned by floor () is still float, because the float value is usually larger than the integer.

PHP takes an integer function Example 1. Floor () example

Copy Code code as follows:

<?
php echo floor (4.3);
4 echo Floor (9.999);
9
?>

round-rounding floating point numbers
Description

Copy Code code as follows:

Float round (float val [, int precision])

Returns the result of rounding Val according to the specified precision precision (number of digits after the decimal point). Precision can also be negative or 0 (the default value).

PHP takes an integer function Example 1. Round () example

Copy Code code as follows:

<?
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
?>

intval---to convert a variable to an integer form
PHP Take the whole function example intval ()

Copy Code code as follows:

<?
php echo intval (4.3);
4 echo intval (4.6);
4
?>