Go PHP Take the whole function: Ceil,floor,round,intval The difference detailed analysis

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

1, Ceil--into a method to take the whole

Description
float ceil (float value)

Returns the next integer not less than value, in which value is entered if there is a fractional part. The type returned by Ceil () is still float, because the range of float values is usually larger than the integer.

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

Echo Ceil (4.3);    //  echoceil(9.999);  //

2, floor--The Rounding method

Description
Float floor (float value)

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

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

Echo  Floor (4.3);   //  echofloor//  9

3, round--rounding of floating-point numbers

Description
Float round (float val [, int precision])

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

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

Echo round(3.4);//3Echo round(3.5);//4Echo round(3.6);//4Echo round(3.6, 0);//4Echo round(1.95583, 2);//1.96Echo round(1241757,-3);//1242000Echo round(5.045, 2);//5.05Echo round(5.055, 2);//5.06

4, Intval---to the variable into an integer form

PHP Rounding Function Example intval ()

Echo intval //  echointval//

Go PHP Take the whole function: Ceil,floor,round,intval The difference detailed analysis