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rand

(PHP 4, PHP 5, PHP 7, PHP 8)

randGenerate a random integer

Açıklama

rand(): int
rand(int $min, int $max): int

If called without the optional min, max arguments rand() returns a pseudo-random integer between 0 and getrandmax(). If you want a random number between 5 and 15 (inclusive), for example, use rand(5, 15).

Dikkat

Bu işlev kriptografik olarak güvenilir değerler üretmez ve kriptografik amaçlarla veya döndürülen değerlerin tahmin edilemez olmasını gerektiren amaçlarla kullanılmamalıdır.

Kriptografik olarak güvenilir rastgelelik gerekliyse Random\Randomizer sınıfı Random\Engine\Secure motoru ile kullanılabilir. Basit kullanım durumlarında random_int() ve random_bytes() işlevleri, işletim sisteminin CSPRNG’i tarafından desteklenen kullanışlı ve güvenli bir arayüz sağlar.

Bilginize: On some platforms (such as Windows), getrandmax() is only 32767. If you require a range larger than 32767, specifying min and max will allow you to create a range larger than this, or consider using mt_rand() instead.

Bilginize: As of PHP 7.1.0, rand() uses the same random number generator as mt_rand(). To preserve backwards compatibility rand() allows max to be smaller than min as opposed to returning false as mt_rand().

Bağımsız Değişkenler

min

The lowest value to return (default: 0)

max

The highest value to return (default: getrandmax())

Dönen Değerler

A pseudo random value between min (or 0) and max (or getrandmax(), inclusive).

Sürüm Bilgisi

Sürüm: Açıklama
7.2.0 rand() has received a bug fix for a modulo bias bug. This means that sequences generated with a specific seed may differ from PHP 7.1 on 64-bit machines.
7.1.0 rand() has been made an alias of mt_rand().

Örnekler

Örnek 1 rand() example

<?php
echo rand(), "\n";
echo
rand(), "\n";

echo
rand(5, 15), "\n";
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

7771
22264
11

Notlar

Uyarı

min max range must be within the range getrandmax(). i.e. (max - min) <= getrandmax() Otherwise, rand() may return poor-quality random numbers.

Ayrıca Bakınız

  • srand() - Seed the random number generator
  • getrandmax() - Show largest possible random value
  • mt_rand() - Generate a random value via the Mersenne Twister Random Number Generator
  • random_int() - Get a cryptographically secure, uniformly selected integer
  • random_bytes() - Get cryptographically secure random bytes

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User Contributed Notes 1 note

up
3
relsqui at armory dot com
19 years ago
Don't forget, it's faster to use bitwise operations when you need a random number that's less than some power of two. For example,

<?php
rand
()&1;
// instead of
rand(0,1);
// for generating 0 or 1,

rand()&3;
// instead of
rand(0,3);
// for generating 0, 1, 2, or 3,

rand()&7;
// instead of
rand(0,7)
// for generating 0, 1, 2, 3, 4, 5, 6, or 7,
?>

and so on. All you're doing there is generating a default random number (so PHP doesn't have to parse any arguments) and chopping off the piece that's useful to you (using a bitwise operation which is faster than even basic math).
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