In PHP, the round () function rounds the floating point number, and the round rounds the number. _ PHP Tutorial-php Tutorial

In PHP, the round () function rounds a floating point number. In PHP, the round () function rounds a floating point number. in this article, the round () function rounds a floating point number. The round () function in PHP is used to round the floating point number.

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)

Parameters	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 ).

Tips and comments

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 ";
?>

I hope this article will help you with PHP programming.

The round () function is used to round the floating point number. round rounding is used to round the floating point number in PHP. Share it with you...