This example describes how the round () function in PHP rounds the floating-point numbers. Share to everyone for your reference. The specific methods are as follows:
Syntax: Round (X,PREC)
| Parameters |
Describe |
| X |
Optionally, specify the number to be rounded. |
| Prec |
Optionally, specify the number of digits after the decimal point. |
Description: Returns the result of rounding x according to the specified precision Prec (number of digits after the decimal point), Prec can also be negative or 0 (default).
Tips and comments
Note: PHP does not correctly handle strings similar to "12,300.2" by default.
Note: The Prec parameter was introduced in PHP 4, and the instance code is as follows:
Copy Code code as follows:
<?php
*/
Echo round (3.4); Output 3
echo "<br>";
Echo round (3.5); Output 4
echo "<br>";
Echo round (3.6); Output 4
echo "<br>";
Echo round (3.6,0); Output 4
echo "<br>";
Echo round (1.95583,2); Output 1.96
echo "<br>";
Echo round (1241757,-3); Output 1242000
echo "<br>";
Echo round (4.045,2); Output 4.05
echo "<br>";
Echo round (4.055,2); Output 4.06
Using the Stdround function to replace PHP's round function
?>
Copy Code code as follows:
<?php
function Stdround ($num, $d =0)
{
Return round ($num + 0.0001/pow ($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 your PHP program design.
