PHP - random_bytes

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Metóda - random_bytes

(PHP 7)

random_bytes() is used to generate a pseudo-random string of bytes, that can be surely used for cryptographic operations.

As a source of entropy is used "getrandom(2)":https://manpages.debian.org/…om.2.en.html (on Linux systems) or "CryptGetRandom":https://msdn.microsoft.com/…=vs.85).aspx (on Windows systems). On other systems (or if none of the previous is available), /dev/urandom is used.

If none of the above sources can be used, an exception is thrown.

Procedurálne

• function random_bytes (int $length) : string

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$length	int		The length of the requested string in bytes.

Mávratovej hodnoty

Vracia: string

Returns a string of the requested length containing pseudo-randomly generated bytes.

Príklady

Generating a pseudo-random token (encoded to base64):

<?php
    $randomBytes = random_bytes(64);
    $token = base64_encode($randomBytes);
    echo $token;
?>