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round

(PHP 4, PHP 5)

round — Rounds a float

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round

(PHP 4, PHP 5)

round — Rounds a float

float round(float $val[, int $precision = 0[, int $mode = PHP_ROUND_HALF_UP]])

$val:
$precision:
$mode:

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Description #

float round ( float $val [, int $precision = 0 [, int $mode = PHP_ROUND_HALF_UP ]] )

Returns the rounded value of val to specified precision (number of digits after the decimal point). precision can also be negative or zero (default).

Note: PHP doesn't handle strings like "12,300.2" correctly by default. See converting from strings.

Parameters #

val

The value to round

precision

The optional number of decimal digits to round to.

mode

Use one of the following constants to specify the mode in which rounding occurs.

Constant	Description
`PHP_ROUND_HALF_UP`	Round `val` up to `precision` decimal places away from zero, when it is half way there. Making 1.5 into 2 and -1.5 into -2.
`PHP_ROUND_HALF_DOWN`	Round `val` down to `precision` decimal places towards zero, when it is half way there. Making 1.5 into 1 and -1.5 into -1.
`PHP_ROUND_HALF_EVEN`	Round `val` to `precision` decimal places towards the next even value.
`PHP_ROUND_HALF_ODD`	Round `val` to `precision` decimal places towards the next odd value.

Return Values #

The rounded value

Examples #

Example #1 round() examples


<?php
echo round(3.4);         // 3
echo round(3.5);         // 4
echo round(3.6);         // 4
echo round(3.6, 0);      // 4
echo round(1.95583, 2);  // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2);    // 5.05
echo round(5.055, 2);    // 5.06
?>

Changelog #

Version	Description
5.3.0	The `mode` parameter was introduced.
5.2.7	The inner workings of round() was changed to conform to the C99 standard.

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round

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