CSPRNG Funktionen
PHP Manual

random_bytes

(PHP 7)

random_bytesGenerates cryptographically secure pseudo-random bytes

Beschreibung

string random_bytes ( int $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.

The sources of randomness used for this function are as follows:

Hinweis: Although this function was added to PHP in PHP 7.0, a » userland implementation is available for PHP 5.2 to 5.6, inclusive.

Parameter-Liste

length

The length of the random string that should be returned in bytes.

Rückgabewerte

Returns a string containing the requested number of cryptographically secure random bytes.

Fehler/Exceptions

Beispiele

Beispiel #1 random_bytes() example

<?php
$bytes 
random_bytes(5);
var_dump(bin2hex($bytes));
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

string(10) "385e33f741"

Siehe auch


CSPRNG Funktionen
PHP Manual