Usage and introduction of PHP rounding functions ceil, floo, round_PHP tutorial

ceil is a function that carries up to get a value;
floor is a function that rounds off decimal places to get a value;
round is a function used for rounding

ceil
Definition and usage:
ceil() function rounds up to the nearest integer.

Copy code The code is as follows:

ceil(x);

Explanation :
Returns the next integer that is not less than x. If x has a decimal part, it will be rounded up.
The type returned by ceil() is still float.

Example:

Copy code The code is as follows:

echo ceil(0.60);
echo "
";
echo ceil(0.40);
echo "
";
echo ceil(5);
echo "
";
echo ceil(5.1);
echo "
";
echo ceil(-5.1);
echo "
";
echo ceil(-5.9);
?>

Output:

Copy code The code is as follows:

1
1
5
6
-5
-5

floor
Definition and usage: The
floor() function rounds down to the nearest integer.

Copy code The code is as follows:

floor(x);

Explanation :
Returns the next integer not greater than x, and rounds the decimal part of x.
The type returned by floor() is still float.

Example:

Copy code The code is as follows:

echo(floor(0.60));
echo "
";
echo(floor(0.40));
echo "
";
echo( floor(5));
echo "
";
echo "
";
echo(floor(5.1));
echo "< br/>";
echo(floor(-5.1));
echo "
";
echo(floor(-5.9))
?>

Output:

Copy code The code is as follows:

0
0
5
5
-6
-6

round
Definition and Usage
round() function rounds floating point numbers.

Copy code The code is as follows:

round(x,prec);

where
x (optional) Specifies the number to be rounded.
prec (optional) specifies the number of digits after the decimal point.

Description:
Returns the result of rounding x according to the specified precision prec (the number of decimal digits after the decimal point). prec can also be negative or zero (default).

Example:

Copy code The code is as follows:

echo round(12.345,-1);
echo "
";
echo round(12.345);
echo "
";
echo round( 0.5);
echo "
";
echo round(0.4);
echo "
";
echo round(-0.5);
echo "
";
echo round(-0.4);
?>

Output:

Copy code The code is as follows:

10
12
1
0
-1
-0

http://www.bkjia.com/PHPjc/313677.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/313677.htmlTechArticleceil is a function that carries up to get a value; floor is a function that rounds off decimal places to get a value; round is Definition and usage of the function ceil used for rounding: ceil() function rounds upward...