XXXVI. GMP Functions
Introduction
These functions allow you to work with arbitrary-length
integers using the GNU MP library.
These functions have been added in PHP 4.0.4.
Note: Most GMP functions accept GMP number arguments, defined
as resource below. However, most of these functions will
also accept numeric and string arguments, given that it
is possible to convert the latter to a number. Also, if
there is a faster function that can operate on integer arguments,
it would be used instead of the slower function when the
supplied arguments are integers. This is done transparently,
so the bottom line is that you can use integers in every
function that expects GMP number. See also the gmp_init()
function.
Warning
If you want to explicitly specify a large integer, specify
it as a string. If you don't do that, PHP will interpret
the integer-literal first, possibly resulting in loss of
precision, even before GMP comes into play.
Note: This extension is not available on Windows platforms.
Requirements
You can download the GMP library from http://www.swox.com/gmp/.
This site also has the GMP manual available.
You will need GMP version 2 or better to use these functions.
Some functions may require more recent version of the GMP
library.
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