(PHP 4, PHP 5, PHP 7, PHP 8)
rand — Generate a random integer
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).
Esta función no genera valores criptográficos fiables por lo que no debería empelarse para propósitos criptográficos. Si fuera necesario un valor criptográfico seguro, considérese utilizar random_int(), random_bytes(), o openssl_random_pseudo_bytes() en su lugar.
Nota: On some platforms (such as Windows), getrandmax() is only 32767. If you require a range larger than 32767, specifying
minandmaxwill allow you to create a range larger than this, or consider using mt_rand() instead.
Nota: As of PHP 7.1.0, rand() uses the same random number generator as mt_rand(). To preserve backwards compatibility rand() allows
maxto be smaller thanminas opposed to returningfalseas mt_rand().
minThe lowest value to return (default: 0)
maxThe highest value to return (default: getrandmax())
A pseudo random value between min (or 0) and max (or getrandmax(), inclusive).
| Versión | Descripción |
|---|---|
| 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(). |
Ejemplo #1 rand() example
<?php
echo rand(), "\n";
echo rand(), "\n";
echo rand(5, 15), "\n";
?>El resultado del ejemplo sería algo similar a:
7771 22264 11
minmax range must be within the range getrandmax(). i.e. (max - min) <= getrandmax() Otherwise, rand() may return poor-quality random numbers.