Random\Randomizer::getBytesFromString

(PHP 8 >= 8.3.0)

Random\Randomizer::getBytesFromStringGet random bytes from a source string

Beschreibung

public Random\Randomizer::getBytesFromString(string $string, int $length): string

Generates a string containing uniformly selected random bytes from the input string with the requested length.

The chance for a byte to be selected is proportional to its share of the input string. If each byte occurs the same amount of times, each byte is equally likely to be selected.

Parameter-Liste

string

The String from which the returned bytes are selected.

length

The length of the random String that should be returned in bytes; must be 1 or greater.

Rückgabewerte

A String containing the requested number of random bytes taken from the input string.

Fehler/Exceptions

Beispiele

Beispiel #1 Random\Randomizer::getBytesFromString() example

<?php
$randomizer
= new \Random\Randomizer();

printf(
"%s.example.com",
$randomizer->getBytesFromString('abcdefghijklmnopqrstuvwxyz0123456789', 16)
);
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

3zsw04eiubcf82jd.example.com

Beispiel #2 Generate a random code for multi-factor authentication

<?php
// The Secure engine is the default, but we make it explicit, because
// multi-factor codes are security sensitive.
$randomizer = new \Random\Randomizer(new \Random\Engine\Secure());

echo
implode('-', str_split($randomizer->getBytesFromString('0123456789', 20), 5));
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

11551-80418-27047-42075

Beispiel #3 Select from a string with a non-uniform distribution

<?php
$randomizer
= new \Random\Randomizer();

echo
$randomizer->getBytesFromString('aaaaabcdef', 20);
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

fddacbeaaeaaacaaaaca

Siehe auch

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