round

(PHP 4, PHP 5, PHP 7)

round — Rounds a float

Descrierea

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

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

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

Parametri

val

The value to round.

precision

The optional number of decimal digits to round to.

If the precision is positive, the rounding will occur after the decimal point.

If the precision is negative, the rounding will occur before the decimal point. If the absolute value of the precision is greater than or equal to the number of digits, the result of the rounding is equal to 0

mode

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

Constante Descriere
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 nearest even value.
PHP_ROUND_HALF_ODD Round val to precision decimal places towards the nearest odd value.

Valorile întoarse

The value rounded to the given precision as a float.

Exemple

Example #1 round() examples

<?php
var_dump(round(3.4));
var_dump(round(3.5));
var_dump(round(3.6));
var_dump(round(3.6, 0));
var_dump(round(1.95583, 2));
var_dump(round(1241757, -3));
var_dump(round(5.045, 2));
var_dump(round(5.055, 2));
?>

Exemplul de mai sus va afișa:

float(3)
float(4)
float(4)
float(4)
float(1.96)
float(1242000)
float(5.05)
float(5.06)

Example #2 How precision affects a float

<?php
$number = 1346.21;

var_dump(round($number, 2));
var_dump(round($number, 1));
var_dump(round($number, 0));
var_dump(round($number, -1));
var_dump(round($number, -2));
var_dump(round($number, -3));
var_dump(round($number, -4));
?>

Exemplul de mai sus va afișa:

float(1346.21)
float(1346.2)
float(1346)
float(1350)
float(1300)
float(1000)
float(0)

Example #3 mode examples

<?php
echo 'Rounding modes with 9.5' . PHP_EOL;
var_dump(round(9.5, 0, PHP_ROUND_HALF_UP));
var_dump(round(9.5, 0, PHP_ROUND_HALF_DOWN));
var_dump(round(9.5, 0, PHP_ROUND_HALF_EVEN));
var_dump(round(9.5, 0, PHP_ROUND_HALF_ODD));

echo 'Rounding modes with 8.5' . PHP_EOL;
var_dump(round(8.5, 0, PHP_ROUND_HALF_UP));
var_dump(round(8.5, 0, PHP_ROUND_HALF_DOWN));
var_dump(round(8.5, 0, PHP_ROUND_HALF_EVEN));
var_dump(round(8.5, 0, PHP_ROUND_HALF_ODD));
?>

Exemplul de mai sus va afișa:

Rounding modes with 9.5
float(10)
float(9)
float(10)
float(9)
Rounding modes with 8.5
float(9)
float(8)
float(8)
float(9)

Example #4 mode with precision examples

<?php
echo 'Using PHP_ROUND_HALF_UP with 1 decimal digit precision' . PHP_EOL;
var_dump(round( 1.55, 1, PHP_ROUND_HALF_UP));
var_dump(round( 1.54, 1, PHP_ROUND_HALF_UP));
var_dump(round(-1.55, 1, PHP_ROUND_HALF_UP));
var_dump(round(-1.54, 1, PHP_ROUND_HALF_UP));

echo PHP_EOL;
echo 'Using PHP_ROUND_HALF_DOWN with 1 decimal digit precision' . PHP_EOL;
var_dump(round( 1.55, 1, PHP_ROUND_HALF_DOWN));
var_dump(round( 1.54, 1, PHP_ROUND_HALF_DOWN));
var_dump(round(-1.55, 1, PHP_ROUND_HALF_DOWN));
var_dump(round(-1.54, 1, PHP_ROUND_HALF_DOWN));

echo PHP_EOL;
echo 'Using PHP_ROUND_HALF_EVEN with 1 decimal digit precision' . PHP_EOL;
var_dump(round( 1.55, 1, PHP_ROUND_HALF_EVEN));
var_dump(round( 1.54, 1, PHP_ROUND_HALF_EVEN));
var_dump(round(-1.55, 1, PHP_ROUND_HALF_EVEN));
var_dump(round(-1.54, 1, PHP_ROUND_HALF_EVEN));

echo PHP_EOL;
echo 'Using PHP_ROUND_HALF_ODD with 1 decimal digit precision' . PHP_EOL;
var_dump(round( 1.55, 1, PHP_ROUND_HALF_ODD));
var_dump(round( 1.54, 1, PHP_ROUND_HALF_ODD));
var_dump(round(-1.55, 1, PHP_ROUND_HALF_ODD));
var_dump(round(-1.54, 1, PHP_ROUND_HALF_ODD));
?>

Exemplul de mai sus va afișa:

Using PHP_ROUND_HALF_UP with 1 decimal digit precision
float(1.6)
float(1.5)
float(-1.6)
float(-1.5)

Using PHP_ROUND_HALF_DOWN with 1 decimal digit precision
float(1.5)
float(1.5)
float(-1.5)
float(-1.5)

Using PHP_ROUND_HALF_EVEN with 1 decimal digit precision
float(1.6)
float(1.5)
float(-1.6)
float(-1.5)

Using PHP_ROUND_HALF_ODD with 1 decimal digit precision
float(1.5)
float(1.5)
float(-1.5)
float(-1.5)

Istoricul schimbărilor

Versiune Descriere
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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