The round() function in PHP rounds floating point numbers, round rounding
The example in this article describes how the round() function in PHP rounds floating-point numbers. Share it with everyone for your reference. The specific method is as follows:
Syntax: round(x,prec)
| 参数 |
描述 |
| x |
可选,规定要舍入的数字. |
| prec |
可选,规定小数点后的位数. |
Description: Returns the result of rounding x according to the specified precision prec (the number of digits after the decimal point). prec can also be a negative number or zero (default value).
Tips and Notes
Note: PHP cannot handle strings like "12,300.2" correctly by default.
Note: The prec parameter was introduced in PHP 4. The example code is as follows:
Copy code The code is as follows:
*/
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 stdround function instead of php's round function
?>
Copy code The code is as follows:
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 ";
?>
希望本文所述对大家的PHP程序设计有所帮助。
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