GMP Functions

简介

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 available on Windows platforms since PHP 5.1.0.

需求

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.

安装

In order to have these functions available, you must compile PHP with GMP support by using the --with-gmp option.

运行时配置

本扩展模块在 php.ini 中未定义任何配置选项。

资源类型

Most GPM functions operate on or return GMP number resources.

预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

GMP_ROUND_ZERO (integer)
GMP_ROUND_PLUSINF (integer)
GMP_ROUND_MINUSINF (integer)
GMP_VERSION (string): The GMP library version

范例

Example#1 Factorial function using GMP


<?php
function fact($x) 
{
    $return = 1;
    for ($i=2; $i < $x; $i++) {
        $return = gmp_mul($return, $i);
    }
    return $return;
}

echo gmp_strval(fact(1000)) . "\n";
?>

This will calculate factorial of 1000 (pretty big number) very fast.

参见

More mathematical functions can be found in the sections BCMath Arbitrary Precision Mathematics Functions and Mathematical Functions.

gmp_abs — Absolute value
gmp_add — Add numbers
gmp_and — Logical AND
gmp_clrbit — Clear bit
gmp_cmp — Compare numbers
gmp_com — Calculates one's complement
gmp_div_q — Divide numbers
gmp_div_qr — Divide numbers and get quotient and remainder
gmp_div_r — Remainder of the division of numbers
gmp_div — 别名 gmp_div_q
gmp_divexact — Exact division of numbers
gmp_fact — Factorial
gmp_gcd — Calculate GCD
gmp_gcdext — Calculate GCD and multipliers
gmp_hamdist — Hamming distance
gmp_init — Create GMP number
gmp_intval — Convert GMP number to integer
gmp_invert — Inverse by modulo
gmp_jacobi — Jacobi symbol
gmp_legendre — Legendre symbol
gmp_mod — Modulo operation
gmp_mul — Multiply numbers
gmp_neg — Negate number
gmp_nextprime — Find next prime number
gmp_or — Logical OR
gmp_perfect_square — Perfect square check
gmp_popcount — Population count
gmp_pow — Raise number into power
gmp_powm — Raise number into power with modulo
gmp_prob_prime — Check if number is "probably prime"
gmp_random — Random number
gmp_scan0 — Scan for 0
gmp_scan1 — Scan for 1
gmp_setbit — Set bit
gmp_sign — Sign of number
gmp_sqrt — Calculate square root
gmp_sqrtrem — Square root with remainder
gmp_strval — Convert GMP number to string
gmp_sub — Subtract numbers
gmp_testbit — Tests if a bit is set
gmp_xor — Logical XOR


	PHP5中文手册 textdomain gmp_abs 函数参考 PHP Manual GMP Functions 简介 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 available on Windows platforms since PHP 5.1.0. 需求 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. 安装 In order to have these functions available, you must compile PHP with GMP support by using the --with-gmp option. 运行时配置本扩展模块在 `php.ini` 中未定义任何配置选项。资源类型 Most GPM functions operate on or return GMP number resources. 预定义常量以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。 `GMP_ROUND_ZERO` (integer) `GMP_ROUND_PLUSINF` (integer) `GMP_ROUND_MINUSINF` (integer) `GMP_VERSION` (string) The GMP library version 范例 Example#1 Factorial function using GMP `<?php function fact($x) { $return = 1; for ($i=2; $i < $x; $i++) { $return = gmp_mul($return, $i); } return $return; } echo gmp_strval(fact(1000)) . "\n"; ?>` This will calculate factorial of 1000 (pretty big number) very fast. 参见 More mathematical functions can be found in the sections BCMath Arbitrary Precision Mathematics Functions and Mathematical Functions. Table of Contents gmp_abs — Absolute value gmp_add — Add numbers gmp_and — Logical AND gmp_clrbit — Clear bit gmp_cmp — Compare numbers gmp_com — Calculates one's complement gmp_div_q — Divide numbers gmp_div_qr — Divide numbers and get quotient and remainder gmp_div_r — Remainder of the division of numbers gmp_div — 别名 gmp_div_q gmp_divexact — Exact division of numbers gmp_fact — Factorial gmp_gcd — Calculate GCD gmp_gcdext — Calculate GCD and multipliers gmp_hamdist — Hamming distance gmp_init — Create GMP number gmp_intval — Convert GMP number to integer gmp_invert — Inverse by modulo gmp_jacobi — Jacobi symbol gmp_legendre — Legendre symbol gmp_mod — Modulo operation gmp_mul — Multiply numbers gmp_neg — Negate number gmp_nextprime — Find next prime number gmp_or — Logical OR gmp_perfect_square — Perfect square check gmp_popcount — Population count gmp_pow — Raise number into power gmp_powm — Raise number into power with modulo gmp_prob_prime — Check if number is "probably prime" gmp_random — Random number gmp_scan0 — Scan for 0 gmp_scan1 — Scan for 1 gmp_setbit — Set bit gmp_sign — Sign of number gmp_sqrt — Calculate square root gmp_sqrtrem — Square root with remainder gmp_strval — Convert GMP number to string gmp_sub — Subtract numbers gmp_testbit — Tests if a bit is set gmp_xor — Logical XOR textdomain gmp_abs 函数参考 PHP Manual

GMP Functions

简介

需求

安装

运行时配置

资源类型

预定义常量

范例

参见

Table of Contents