(PHP 7)
random_bytes — Generates cryptographically secure pseudo-random bytes
$length
)Generates an arbitrary length string of cryptographic random bytes that are suitable for cryptographic use, such as when generating salts, keys or initialization vectors.
As fontes de aleatoriedade dessa função são:
Nota: Embora essa função tenha sido adicionado no PHP 7.0, existe » implementação userland disponível para PHP 5.2 ao 5.6.
lengthThe length of the random string that should be returned in bytes.
Returns a string containing the requested number of cryptographically secure random bytes.
Exemplo #1 random_bytes() example
<?php
$bytes = random_bytes(5);
var_dump(bin2hex($bytes));
?>
O exemplo acima irá imprimir algo similar à:
string(10) "385e33f741"