round

(PHP 4, PHP 5, PHP 7)

round — 锟皆革拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

说锟斤拷

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

锟斤拷锟截斤拷 val 锟斤拷锟斤拷指锟斤拷锟斤拷锟斤拷 precision锟斤拷十锟斤拷锟斤拷小锟斤拷锟斤拷锟斤拷锟斤拷值锟斤拷锟侥匡拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥斤拷锟斤拷锟�precision 也锟斤拷锟斤拷锟角革拷锟斤拷锟斤拷锟姐（默锟斤拷值锟斤拷锟斤拷

Note: PHP 默锟较诧拷锟斤拷锟斤拷确锟斤拷锟斤拷锟斤拷锟斤拷 "12,300.2" 锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟街凤拷锟斤拷转锟斤拷为锟斤拷值锟斤拷

锟斤拷锟斤拷

val

要锟斤拷锟斤拷锟街�

precision

锟斤拷选锟斤拷十锟斤拷锟斤拷小锟斤拷锟斤拷锟斤拷锟斤拷值锟斤拷锟侥匡拷锟�

mode

锟斤拷锟斤拷之一锟斤拷 PHP_ROUND_HALF_UP锟斤拷 PHP_ROUND_HALF_DOWN PHP_ROUND_HALF_EVEN 锟斤拷 PHP_ROUND_HALF_ODD

锟斤拷锟斤拷值

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷值

锟斤拷锟斤拷

Example #1 round() 锟斤拷锟斤拷

<?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
?>

Example #2 mode 锟斤拷锟斤拷

<?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
?>

锟斤拷锟斤拷锟斤拷志

锟芥本 说锟斤拷
5.3.0 锟斤拷锟斤拷锟斤拷 mode 锟斤拷锟斤拷
5.2.7 round() 锟斤拷锟节诧拷锟斤拷锟斤拷锟睫改凤拷锟斤拷 C99 锟侥憋拷准锟斤拷

锟轿硷拷

  • ceil() - 锟斤拷一锟斤拷取锟斤拷
  • floor() - 锟斤拷去锟斤拷取锟斤拷
  • number_format() - 锟斤拷千位锟街革拷锟斤拷锟斤拷式锟斤拷式锟斤拷一锟斤拷锟斤拷锟斤拷