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.
注: 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.
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注: This extension is not available on Windows platforms.
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.
In order to have these functions available, you
must compile PHP with GMP
support by using the --with-gmp
option.
More mathmatical functions can be found in the
sections BCMath Arbitrary
Precision Mathematics Functions and Mathematical Functions.