gmp_strval

(PHP 4 >= 4.0.4, PHP 5)

gmp_strval — Convert GMP number to string

Описание

string gmp_strval ( resource $gmpnumber [, int $base ] )

Convert GMP number to string representation in base base . The default base is 10.

Список параметров

gmpnumber

The GMP number that will be converted to a string.

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

base

The base of the returned number. The default base is 10. Allowed values for the base are from 2 to 36.

Возвращаемые значения

The number, as a string.

Примеры

Пример #1 Converting a GMP number to a string


<?php
$a = gmp_init("0x41682179fbf5");
printf("Decimal: %s, 36-based: %s", gmp_strval($a), gmp_strval($a,36));
?>

add a note User Contributed Notes
gmp_strval

php at richardneill dot org
19-Sep-2006 04:47


I think it's no longer necessary to worry about trailing nulls. This was fixed in Feb 2002 (see bug 10133)

caldwell at utm dot NoSpamPlease dot edu
22-Jul-2001 08:17


Warning: gmp_strval may return a null terminated string (e.g., gmp_strval(gmp_init(8)) has two characters. This is because gmp is built for speed, so uses estimates based on things it can get quickly, like the number of bits in N. So since 8 is a 4 bit number, it will be allocated ceil(log10(2^4))=ceil(4*0.30103....) = 2 characters. The gmp folks feel it is the caller's responsibility (in this case the PHP interface) to check whether or not all the characters were required.  PHP might have done this for us (and may in the future), but for now, you need to check (if it matters to you--it sure did in my program!).

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gmp_sub

gmp_sqrtrem

Last updated: Fri, 10 Oct 2008