The usage and introduction of the Ceil,floo,round function in PHP _php skills

Ceil is a function of rounding up to get a value;
Floor is a function of dropping a decimal bit to get a value;
Round is a function for rounding.

Ceil
Definition and Usage:
The Ceil () function is rounded up to the nearest integer.

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Ceil (x);

Description:
Returns the next integer not less than x, if X has a decimal part.
The type returned by Ceil () is still float.

Example:

Copy Code code as follows:

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

output:

Copy Code code as follows:

1
1
5
6
-5
-5

Floor
Definition and Usage:
The floor () function is rounded down to the nearest integer.

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Floor (x);

Description:
Returns the next integer less than x, rounding out the decimal part of X.
The type returned by floor () is still float.

Example:

Copy Code code as follows:

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

output:

Copy Code code as follows:

0
0
5
5
-6
-6

Round
Definitions and usage
The round () function rounds the floating-point numbers.

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Round (X,PREC);

which
X (optional) Specify the number to round.
PREC (optional) 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 (the default value).

Example:

Copy Code code as follows:

<?php
Echo round (12.345,-1);
echo "<br/>";
Echo round (12.345);
echo "<br/>";
Echo round (0.5);
echo "<br/>";
Echo round (0.4);
echo "<br/>";
Echo Round (-0.5);
echo "<br/>";
Echo round (-0.4);
?>

output:

Copy Code code as follows:

10
12
1
0
-1
-0