PHP to take the whole, rounded rounding, up rounding, down to the whole, decimal intercept ____php

php to take the integer function commonly used in four ways:

1. Direct rounding, discard decimals, keep integers: intval ();
2. Rounded rounding: round ();
3. Take the whole up, there are decimals plus 1:ceil ();
4. Take the whole down: floor ().

One, intval-to the variable to the integer form
Intval is automatically converted to 0 if it is a character type.

Intval (3.14159);  3
intval (3.64159);  3
intval (' Ruesin ');//0

Second, rounded: round ()

The parameter 1 is rounded according to the specified precision of parameter 2. Parameter 2 can be a negative number or 0 (the default value).

Round (3.14159);      3
round (3.64159);      4
round (3.64159, 0);   4
Round (3.64159, 2);   3.64
Round (5.64159, 3);   3.642
Round (364159,-2);   364200

Third, to take the whole up, with a decimal number plus 1:ceil ()

Returns the next integer that is not less than value, or the value if there is a decimal part.

This method is often used when we write page classes to calculate the number of pages.

Ceil (3.14159);  4
ceil (3.64159);  4

Four, downward rounding: Floor ()

Returns the next integer not more than value, rounding out the decimal part of value.

Floor (3.14159);    3
floor (3.64159);    3

Reprint please indicate the source: http://blog.csdn.net/churk2012/article/details/51424588