# Difference between the ceil, floor, round, and intval functions in php

Source: Internet
Author: User
Tags floor function
During the development process, which of the following statements will you use for data processing and rounding? Xiao Tao will introduce the PHP integer functions including ceil, floor, round, and intval. The following describes in detail: 1. ceil & mdash; if the sum is obtained by the first method, floatceil (float \$ value) returns no less... "> <LINKhref =" http://www.ph

During the development process, which of the following statements will you use for data processing and rounding? Xiao Tao will introduce the PHP integer functions including ceil, floor, round, and intval. The following describes in detail:

1. ceil-one-to-one method for integer
Description
Float ceil (float \$ value)
Returns the next integer of no less than value. if the value has a decimal part, it is entered in one place. The type returned by ceil () is still float, because the float value range is usually larger than integer.
Ceil () example

1. Echo ceil (4.3); // 5
2. Echo ceil (9.999); // 10
3. ?>

2. floor-rounding
Description
Float floor (float \$ value)
Returns the next integer not greater than value and rounds the decimal part of value. The return type of floor () is still float, because the float value range is usually larger than that of integer.
Floor () example

1. Echo floor (4.3); // 4
2. Echo floor (9.999); // 9
3. ?>

3. round-round the floating point number
Description
Float round (float \$ val [, int \$ precision])
Returns the result of rounding val by the specified precision (number of digits after decimal point. Precision can also be negative or zero (default ).
Round () example

1. Echo round (3.4); // 3
2. Echo round (3.5); // 4
3. Echo round (3.6); // 4
4. Echo round (3.6, 0); // 4
5. Echo round (1.95583, 2); // 1.96
6. Echo round (1241757,-3); // 1242000
7. Echo round (5.045, 2); // 5.05
8. Echo round (5.055, 2); // 5.06
9. ?>

Note: PHP cannot properly process strings similar to "12,300.2 & Prime;" by default.
Note: the precision parameter is introduced in PHP 4.

4. intval-get the integer value of the variable
Description
Int intval (mixed \$ var [, int \$ base])
Return the integer value of the variable var by using a specific hexadecimal conversion (decimal by default.
Var can be any scalar type. Intval () cannot be used for array or object.
Intval () example

1. Echo intval (4.3); // 4
2. Echo intval (9.999); // 9
3. ?>

Note:
The base parameter of intval () does not work unless the var parameter is a string.

I personally think that the floor function and intval function have the same function. The difference is that one is a returned floating point number (float), and the other is an integer, because the float value range is usually larger than integer. However, the values are equal.

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