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# PHP | round( ) Function

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 parameters out of which one is compulsory and two are optional. All of these parameters are described below:

1. \$number: It is the number which you want to round.
2. \$precision: It is an optional parameter. It specifies the number of decimal digits to round to. The default value of this parameter is zero.
3. \$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

 ``

Output:

`1`
• When a parameter is passed with a specific precision value:

## PHP

 ``

Output:

`0.71`
• When a negative value is passed as a parameter:

## PHP

 ``

Output:

`-3`
• Passing parameters with mode:

## PHP

 ``

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.

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