ceil, floo and round function in php_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:

The ceil() function rounds up to the nearest integer.

[php]
ceil(x);

ceil(x);
Description:

Returns the next integer that is not less than x. If x has a decimal part, it is rounded up.

The type returned by ceil() is still float.

Example:

[php]
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);
?>

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:

[php]
1
1
5
6
-5
-5

1
1
5
6
-5
-5

floor
Definition and usage:

The floor() function rounds down to the nearest integer.

[php]
floor(x);

floor(x);
Description:

Returns the next integer not greater than x, rounding off the decimal part of x.

The type returned by floor() is still float.

Example:

[php]
echo(floor(0.60));
echo "
";
echo(floor(0.40));
echo "
";
echo(floor(5));
echo "
";
echo "
";
echo(floor(5.1));
echo "
";
echo(floor(-5.1));
echo "
";
echo(floor(-5.9))
?>

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

Output:

[php]
0
0
5
5
-6
-6

0
0
5
5
-6
-6
round
Definition and Usage

The round() function rounds floating point numbers.

[php]
round(x,prec);

round(x,prec);

Which

x (optional) Specifies the number to be rounded.

prec (optional) specifies the number of digits after the decimal point.

Description:

Returns x rounded to the specified precision prec (the number of decimal digits after the decimal point).

prec can also be negative or zero (default).

Example:

[php]
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);
?>

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:

[php]
10
12
1
0
-1
-0

http://www.bkjia.com/PHPjc/477158.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/477158.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 Function used for rounding. ceil definition and usage: ceil() function rounds upward...