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PHP回合

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Aug 29, 2024 pm 01:10 PM

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每当需要将给定的浮点数向上或向下舍入到最接近的整数时，我们都会使用 PHP 中称为舍入函数的函数。它需要三个参数，即数量、精度和模式。其中 number 是已向上舍入或向下舍入到最接近的整数的浮点数。 Precision表示要舍入的小数位数，该参数是可选的，mode是指定舍入模式的常量，该参数也是可选的，其值可以是PHP_ROUND_HALF_UP、PHP_ROUND_HALF_DOWN、PHP_ROUND_HALF_EVEN或PHP_ROUND_HALF_ODD。

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在 PHP 中声明舍入函数的语法：

round(number, precision, mode)

哪里，

数字是向上舍入或向下舍入到最接近的整数的浮点数。
精度表示要四舍五入到的小数位数，此参数是可选的。
Mode 是指定舍入模式的常量，该参数也是可选的，其值可以是 PHP_ROUND_HALF_UP、PHP_ROUND_HALF_DOWN、PHP_ROUND_HALF_EVEN 或 PHP_ROUND_HALF_ODD。

PHP 中 round 函数的工作原理

每当需要将给定的浮点数向上或向下舍入到最接近的整数时，我们都会使用 PHP 中称为舍入函数的函数。
PHP 中的 round 函数需要三个参数，分别是数字、精度和众数。
参数编号是向上舍入或向下舍入到最接近的整数的浮点数。
参数精度表示要四舍五入到的小数位数，可选。
参数mode是一个常量，指定舍入模式，该参数也是可选的，其值可以是PHP_ROUND_HALF_UP、PHP_ROUND_HALF_DOWN、PHP_ROUND_HALF_EVEN或PHP_ROUND_HALF_ODD。

PHP回合示例

以下是 PHP 回合的示例：

示例#1

PHP 程序，用于说明舍入函数的工作原理，将给定的浮点整数四舍五入为最接近的整数，最多三位小数值。

代码：


<?php #round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called a
$a = round(6.7654,3);
#round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called b
$b = round(2.98765,3);
#round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called c
$c = round(5.87654,3);
#The result after using the round function is displayed as the output on the screen
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $a;
echo "<br>";
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $b;
echo "<br>";
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $c;
echo "<br>";
?>

输出：

PHP回合

在上面的程序中，round 函数用于将给定的浮点整数四舍五入到最接近的整数，最多三位小数，并存储在名为 a、b 和 c 的变量中。然后，将给定浮点整数四舍五入到最接近的整数2（最高可达舍入函数中指定的小数值）后的结果将作为输出显示在屏幕上。

示例#2

PHP 程序，用于说明舍入函数的工作原理，将给定的浮点整数四舍五入到最接近的整数，最多一位小数值。

代码：


<?php #round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called a
$a = round(8.37465,1);
#round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called b
$b = round(1.09456,1);
#round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called c
$c = round(3.87654,1);
#The result after using the round function is displayed as the output on the screen
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $a;
echo "<br>";
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $b;
echo "<br>";
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $c;
echo "<br>";
?>

输出：

PHP回合

示例 #3

PHP 程序，用于说明舍入函数的工作原理，将给定的浮点整数四舍五入为最接近的整数，最多两位小数。

代码：


<?php #round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called a
$a = round(4.273645,2);
#round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called b
$b = round(7.45567,2);
#round function is used on the given floating point number to round to up to three decimal values and is stored in a variable called c
$c = round(9.3778335,2);
#The result after using the round function is displayed as the output on the screen
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $a;
echo "<br>";
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $b;
echo "<br>";
echo("The value after the given floating point number is rounded to the nearest integer is: ");
echo $c;
echo "<br>";
?>

输出：

PHP回合