PHP round() Function

Example

Round numbers:

<?php
echo(round(0.60) . " ");
echo(round(0.50) . " ");
echo(round(0.49) . " ");
echo(round(-4.40) . " ");
echo(round(-4.60));
?>

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Definition and Usage

The round() function rounds a floating-point number.

Tip: To round a number UP to the nearest integer, look at the ceil() function.

Tip: To round a number DOWN to the nearest integer, look at the floor() function.

Syntax

round( number,precision,mode);

Parameter Values

Parameter	Description
number	Required. Specifies the value to round
precision	Optional. Specifies the number of decimal digits to round to. Default is 0
mode	Optional. Specifies a constant to specify the rounding mode: PHP_ROUND_HALF_UP - Default. Rounds number up to precision decimal, when it is half way there. Rounds 1.5 to 2 and -1.5 to -2 PHP_ROUND_HALF_DOWN - Round number down to precision decimal places, when it is half way there. Rounds 1.5 to 1 and -1.5 to -1 PHP_ROUND_HALF_EVEN - Round number to precision decimal places towards the next even value PHP_ROUND_HALF_ODD - Round number to precision decimal places towards the next odd value

Technical Details

Return Value:	The rounded value
Return Type:	Float
PHP Version:	4+
PHP Changelog:	PHP 5.3: The mode parameter was added

More Examples

Example

Round numbers to two decimals:

<?php
echo(round(4.96754,2) . " ");
echo(round(7.045,2) . " ");
echo(round(7.055,2));
?>

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Example

Round numbers using the constants:

<?php
echo(round(1.5,0,PHP_ROUND_HALF_UP) . " ");
echo(round(-1.5,0,PHP_ROUND_HALF_UP) . " ");

echo(round(1.5,0,PHP_ROUND_HALF_DOWN) . " ");
echo(round(-1.5,0,PHP_ROUND_HALF_DOWN) . " ");

echo(round(1.5,0,PHP_ROUND_HALF_EVEN) . " ");
echo(round(-1.5,0,PHP_ROUND_HALF_EVEN) . " ");

echo(round(1.5,0,PHP_ROUND_HALF_ODD) . " ");
echo(round(-1.5,0,PHP_ROUND_HALF_ODD));
?>

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❮ PHP Math Reference