(PHP 7, PHP 8)
random_bytes — Get cryptographically secure random bytes
$length): stringGenerates 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 usadas para esta função são as seguintes:
Nota: Embora esta função tenha sido adicionada ao PHP no PHP 7.0, uma » implementação no espaço do usuário está disponível para o PHP 5.2 ao 5.6, inclusive.
length
The length of the random string that should be returned in bytes; must be 1 or greater.
A string containing the requested number of cryptographically secure random bytes.
length is less than 1,
a ValueError will be thrown.
| Versão | Descrição |
|---|---|
| 8.2.0 | In case of a CSPRNG failure, this function will now throw a Random\RandomException. Previously a plain Exception was thrown. |
Exemplo #1 random_bytes() example
<?php
$bytes = random_bytes(5);
var_dump(bin2hex($bytes));
?>
O exemplo acima produzirá algo semelhante a:
string(10) "385e33f741"
<?php
function str_rand(int $length = 64){ // 64 = 32
$length = ($length < 4) ? 4 : $length;
return bin2hex(random_bytes(($length-($length%2))/2));
}
var_dump(str_rand());
// d6199909d0b5fdc22c9db625e4edf0d6da2b113b21878cde19e96f4afe69e714
?>
