In PHP, round means "rounding" and is a built-in function that converts floating point numbers into integers. This function can round floating point numbers and return an integer value of float type. Syntax "round(number,precision,mode);".
The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer
Introduction to php round() function
PHP
has two data types for numbers: Integer
integer type and Float
floating point type. In some special circumstances, we can only use integer types, and for floating point types, we can only convert them to integer types. PHP
provides the round()
function , can help us accomplish this task.
In PHP, round means "rounding", and its function is to round floating point numbers and return an integer.
Grammar format:
round(number,precision,mode);
Parameters | Description |
---|---|
number | Required. Specifies the value to be rounded. |
precision | Optional. Specifies the number of digits after the decimal point. Default is 0, can also be negative. |
mode | Optional. Specifies a constant representing the rounding mode:
|
Return value: Returns an integer of type float
php round Examples of using the () function
1. Only one parameter:
<?php header("Content-type:text/html;charset=utf-8"); echo round(6.1)."、"; echo round(6.2)."、"; echo round(6.3)."、"; echo round(6.4)."、"; echo round(6.5)."、"; echo round(6.6)."、"; echo round(6.64)."<br>"; ?>
2. There are two parameters:
<?php header("Content-type:text/html;charset=utf-8"); echo round(6.4545,3)."、"; echo round(6.4545,2)."、"; echo round(6.4545,1)."、"; echo round(6.4545,0)."<br>"; ?>
3. Three parameters:
<?php header("Content-type:text/html;charset=utf-8"); echo round(6.65,1,PHP_ROUND_HALF_DOWN)."<br>";//向下取整 echo round(6.65,1,PHP_ROUND_HALF_UP)."<br>";//向上取整 echo round(6.55,1,PHP_ROUND_HALF_EVEN)."<br>";//遇到 .5 的情况时取下一个偶数值舍入$val到 $precision小数位。 echo round(6.55,1,PHP_ROUND_HALF_ODD)."<br>";//遇到 .5 的情况时取下一个奇数值舍入$val到 $precision小数位。 ?>
Extended knowledge: the other two rounding functions
ceil() function: round up to the nearest integer
floor() function: round down to the nearest integer
Recommended learning: "PHP Video Tutorial"
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