PHP: gmp_random - Manual (original) (raw)

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gmp_random — Random number

Warning

This function has been_DEPRECATED_ as of PHP 7.2.0, and REMOVED as of PHP 8.0.0. Relying on this function is highly discouraged.

Description

gmp_random(int $limiter = 20): GMP

A limb is an internal GMP mechanism. The number of bits in a limb is not static, and can vary from system to system. Generally, the number of bits in a limb is either 32 or 64, but this is not guaranteed.

Caution

This function does not generate cryptographically secure values, and must not be used for cryptographic purposes, or purposes that require returned values to be unguessable.

If cryptographically secure randomness is required, the Random\Randomizer may be used with the Random\Engine\Secure engine. For simple use cases, the random_int() and random_bytes() functions provide a convenient and secure API that is backed by the operating system’s CSPRNG.

Parameters

limiter

The limiter.

A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when base is equal to 0).

Return Values

A random GMP number.

Examples

Example #1 gmp_random() example

<?php $rand1 = gmp_random(1); // random number from 0 to 1 * bits per limb <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>a</mi><mi>n</mi><mi>d</mi><mn>2</mn><mo>=</mo><mi>g</mi><mi>m</mi><msub><mi>p</mi><mi>r</mi></msub><mi>a</mi><mi>n</mi><mi>d</mi><mi>o</mi><mi>m</mi><mo stretchy="false">(</mo><mn>2</mn><mo stretchy="false">)</mo><mo separator="true">;</mo><mi mathvariant="normal">/</mi><mi mathvariant="normal">/</mi><mi>r</mi><mi>a</mi><mi>n</mi><mi>d</mi><mi>o</mi><mi>m</mi><mi>n</mi><mi>u</mi><mi>m</mi><mi>b</mi><mi>e</mi><mi>r</mi><mi>f</mi><mi>r</mi><mi>o</mi><mi>m</mi><mn>0</mn><mi>t</mi><mi>o</mi><mn>2</mn><mo>∗</mo><mi>b</mi><mi>i</mi><mi>t</mi><mi>s</mi><mi>p</mi><mi>e</mi><mi>r</mi><mi>l</mi><mi>i</mi><mi>m</mi><mi>b</mi><mi>e</mi><mi>c</mi><mi>h</mi><mi>o</mi><mi>g</mi><mi>m</mi><msub><mi>p</mi><mi>s</mi></msub><mi>t</mi><mi>r</mi><mi>v</mi><mi>a</mi><mi>l</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">rand2 = gmp_random(2); // random number from 0 to 2 * bits per limbecho gmp_strval(</annotation></semantics></math>rand2=gmprandom(2);//randomnumberfrom0to2∗bitsperlimbechogmpstrval(rand1) . "\n"; echo gmp_strval($rand2) . "\n"; ?>

The above example will output:

1915834968 8642564075890328087

Found A Problem?

asphp at dsgml dot com ¶

9 years ago

Warning: Do not use this function.

Use gmp_random_bits() or gmp_random_range() instead.

The documentation and the code for this function do NOT match, and in any case this function is quite useless.