# The round () function in PHP rounds a floating point number.

Source: Internet
Author: User
Tags rounds
This article mainly introduces how the round () function in PHP rounds floating-point numbers. It summarizes various common usage of the round () function through detailed examples, it is a very practical technique. If you need it, you can refer to it.

This article mainly introduces how the round () function in PHP rounds floating-point numbers. It summarizes various common usage of the round () function through detailed examples, it is a very practical technique. If you need it, you can refer to it.

This example describes how the round () function in PHP rounds a floating point number. Share it with you for your reference. The specific method is as follows:

Syntax: round (x, prec)

Parameter description

X (optional) number to be rounded.

Prec (optional) number of digits after the decimal point.

Note: the result of rounding x to the specified precision prec (number of digits after decimal point) is returned. The prec value can also be a negative number or zero (default value ).

Note: php cannot properly process strings similar to "12,300.2" by default.

Note: The prec parameter is introduced in php 4. The instance code is as follows:

The Code is as follows:

<? Php
*/
Echo round (3.4); // output 3
Echo"
";
Echo round (3.5); // output 4
Echo"
";
Echo round (3.6); // output 4
Echo"
";
Echo round (3.6, 0); // output 4
Echo"
";
Echo round (1.95583, 2); // output 1.96
Echo"
";
Echo round (1241757,-3); // output 1242000
Echo"
";
Echo round (4.045, 2); // output 4.05
Echo"
";
Echo round (4.055, 2); // output 4.06

// Use the stdround function instead of the php round Function
?>

The Code is as follows:

<? Php
Function stdround (\$ num, \$ d = 0)
{
Return round (\$ num + 0.0001/pow (10, \$ d), \$ d );
}

Echo "round (1.005, 2) =". round (1.005, 2). "n ";
Echo "round (1.015, 2) =". round (1.015, 2). "n ";
Echo "round (1.025, 2) =". round (1.025, 2). "n ";
Echo "round (1.035, 2) =". round (1.035, 2). "n ";
Echo "round (1.045, 2) =". round (1.045, 2). "n ";
Echo "round (1.055, 2) =". round (1.055, 2). "n ";
Echo "round (1.065, 2) =". round (1.065, 2). "n ";
Echo "round (1.075, 2) =". round (1.075, 2). "n ";
Echo "round (1.085, 2) =". round (1.085, 2). "n ";
Echo "round (1.095, 2) =". round (1.095, 2). "n ";

Echo "stdround (1.005, 2) =". stdround (1.005, 2). "n ";
Echo "stdround (1.015, 2) =". stdround (1.015, 2). "n ";
Echo "stdround (1.025, 2) =". stdround (1.025, 2). "n ";
Echo "stdround (1.035, 2) =". stdround (1.035, 2). "n ";
Echo "stdround (1.045, 2) =". stdround (1.045, 2). "n ";
Echo "stdround (1.055, 2) =". stdround (1.055, 2). "n ";
Echo "stdround (1.065, 2) =". stdround (1.065, 2). "n ";
Echo "stdround (1.075, 2) =". stdround (1.075, 2). "n ";
Echo "stdround (1.085, 2) =". stdround (1.085, 2). "n ";
Echo "stdround (1.095, 2) =". stdround (1.095, 2). "n ";

\$ M = 0.000000000000001;
Echo "n ";
Echo "round (1.005 + {\$ m}, 2) =". round (1.005 + \$ m, 2). "n ";
Echo "round (1.015 + {\$ m}, 2) =". round (1.015 + \$ m, 2). "n ";
Echo "round (1.025 + {\$ m}, 2) =". round (1.025 + \$ m, 2). "n ";
Echo "round (1.035 + {\$ m}, 2) =". round (1.035 + \$ m, 2). "n ";
Echo "round (1.045 + {\$ m}, 2) =". round (1.045 + \$ m, 2). "n ";
Echo "round (1.055 + {\$ m}, 2) =". round (1.055 + \$ m, 2). "n ";
Echo "round (1.065 + {\$ m}, 2) =". round (1.065 + \$ m, 2). "n ";
Echo "round (1.075 + {\$ m}, 2) =". round (1.075 + \$ m, 2). "n ";
Echo "round (1.085 + {\$ m}, 2) =". round (1.085 + \$ m, 2). "n ";
Echo "round (1.095 + {\$ m}, 2) =". round (1.095 + \$ m, 2). "n ";

Echo "round (1.005, 2) =". round (1.005, 2). "n ";
Echo "round (1.015, 2) =". round (1.015, 2). "n ";
Echo "round (1.025, 2) =". round (1.025, 2). "n ";
Echo "round (1.035, 2) =". round (1.035, 2). "n ";
Echo "round (1.045, 2) =". round (1.045, 2). "n ";
Echo "round (1.055, 2) =". round (1.055, 2). "n ";
Echo "round (1.065, 2) =". round (1.065, 2). "n ";
Echo "round (1.075, 2) =". round (1.075, 2). "n ";
Echo "round (1.085, 2) =". round (1.085, 2). "n ";
Echo "round (1.095, 2) =". round (1.095, 2). "n ";
?>

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