While dealing with problems which have values consisting of a very high number of decimal digits such as (121.76763527823) we often come up with a problem of rounding them up. Rounding them up manually can be a very time consuming and erroneous practice. In place of that, an inbuilt function of PHP i.e round() can be used.
The round() function in PHP is used to round a floating-point number. It can be used to define a specific precision value which rounds number according to that precision value.Precision can be also negative or zero.
The round() function in PHP has 3 parameters which are number, precision, and mode among which the latter two are optional parameters.The round() function returns the rounded value of the argument passed.
Syntax:
float round($number, $precision, $mode);
Parameters: It accepts three paramters out of which one is compulsory and two are optional. All of these parameters are described below:
- $number : It is the number which you want to round.
- $precision : It is an optional parameter. It specifies the number of decimal digits to round to. The default value of this parameter is zero.
- $mode : It is an optional parameter. It specifies a constant to specify the rounding mode. The constant can be one of the following:
- PHP_ROUND_HALF_UP: This mode tells to round up the number specified by parameter $number by precision specified by parameter $precision away from zero.
- PHP_ROUND_HALF_DOWN: This mode tells to round up the number specified by parameter $number by precision specified by parameter $precision towards zero.
- PHP_ROUND_HALF_EVEN: This mode tells to round up the number specified by parameter $number by precision specified by parameter $precision towards nearest even value.
- PHP_ROUND_HALF_ODD: This mode tells to round up the number specified by parameter $number by precision specified by parameter $precision towards nearest odd value.
Return Value: It returns the rounded value.
Examples:
Input : round(0.70) Output : 1 Input : round(0.708782) Output : 0.71 Input : round(-3.40) Output : -3 Input : round(-3.60) Output : -4
Below programs illustrate the working of round() in PHP:
- When a parameter is passed with default precision i.e. ‘0’:
<?php
echo
(
round
(0.70));
?>
Output:
1
- When a parameter is passed with a specific precision value:
<?php
echo
(
round
(0.70878, 2));
?>
Output:
0.71
- When a negative value is passed as a parameter:
<?php
echo
(
round
(-3.40));
?>
Output:
-3
- Passing parameters with mode:
<?php
// round to nearest even value
echo
(
round
(7.5,0,PHP_ROUND_HALF_EVEN));
echo
" "
;
// round to nearest odd value
echo
(
round
(7.5,0,PHP_ROUND_HALF_ODD));
echo
" "
;
// round towards zero
echo
(
round
(7.5,0,PHP_ROUND_HALF_DOWN));
echo
" "
;
// round away from zero
echo
(
round
(7.5,0,PHP_ROUND_HALF_UP));
?>
Output:
8 7 7 8
Important Points To Note:
- round() function is used to round floating point numbers.
- A specific precision value can be used to get the desired results.
- Precision value can also be negative or zero.
Reference:
http://php.net/manual/en/function.round.php
This article is attributed to GeeksforGeeks.org
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- When a parameter is passed with a specific precision value:
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