Math ｴﾘｿ�
PHP Manual

round

(PHP 4, PHP 5)

round — ﾉ簇ｰｾｮｿﾀｿﾝ､皃�

ﾀ篶ﾀ

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

val ､｢ｻﾘﾄ熙ｷ､ｿ precision(ｾｮｿﾀｰﾊｲｼ､ﾎｷ蠢�)､ﾋｴﾝ､皃ｿﾃﾍ､� ﾊﾖ､ｷ､ﾞ､ｹ｡｣precision ､鬢ﾞ､ｿ､ﾏ･ｼ･�(･ﾇ･ﾕ･ｩ･�ﾈ) ､ﾈ､ｹ､�ｳ､ﾈ､箚ﾄﾇｽ､ﾇ､ｹ｡｣

ﾃ擎ﾕ: PHP ､ﾏ｡｢･ﾇ･ﾕ･ｩ･�ﾈ､ﾇ､ﾏ "12,300.2" ､ﾎ､隍ｦ､ﾊ ﾊｸｻ昀ｵ､ｷ､ｯｽ靉�､ｷ､ﾞ､ｻ､｣ﾊｸｻ昀ｫ､鬢ﾎﾊﾑｴｹ ､ｲｾﾈ､ｯ､ﾀ､ｵ､､｡｣

･ﾑ･鬣癸ｼ･ｿ

val

ｴﾝ､皃�ﾍ｡｣

precision

･ｪ･ﾗ･ｷ･逾ﾇｻﾘﾄ熙ｹ､�｢ｴﾝ､皃�蠢｣

mode

PHP_ROUND_HALF_UP｡｢ PHP_ROUND_HALF_DOWN｡｢ PHP_ROUND_HALF_EVEN ､｢､�､､ﾏ PHP_ROUND_HALF_ODD ､ﾎ､､､ｺ､�ｫ｡｣

ﾊﾖ､�ﾍ

The rounded value

ﾎ�

ﾎ�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
?>

ﾎ�2 mode ､ﾎﾎ�

<?php
echo round(9.5, 0, PHP_ROUND_HALF_UP);   // 10
echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9
echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10
echo round(9.5, 0, PHP_ROUND_HALF_ODD);  // 9

echo round(8.5, 0, PHP_ROUND_HALF_UP);   // 9
echo round(8.5, 0, PHP_ROUND_HALF_DOWN); // 8
echo round(8.5, 0, PHP_ROUND_HALF_EVEN); // 8
echo round(8.5, 0, PHP_ROUND_HALF_ODD);  // 9
?>

ﾊﾑｹｹﾍ昀�

･ﾐ｡ｼ･ｸ･逾� ﾀ篶ﾀ
5.3.0 mode ･ﾑ･鬣癸ｼ･ｿ､ｬﾄﾉｲﾃ､ｵ､�ﾞ､ｷ､ｿ｡｣
5.2.7 round() ､ﾎﾆ篷ﾇ､ﾎｵｰ､ｬﾊﾑｹｹ､ｵ､�｢ C99 ﾉｸｽ爨ﾋｽ犒ｹ､�隍ｦ､ﾋ､ﾊ､熙ﾞ､ｷ､ｿ｡｣

ｻｲｹﾍ

Math ｴﾘｿ�
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