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random_bytes

(PHP 7)

random_bytesGenerates cryptographically secure pseudo-random bytes

설명

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:

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

인수

length

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

반환값

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

오류/예외

예제

Example #1 random_bytes() example

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

위 예제의 출력 예시:

string(10) "385e33f741"

참고


CSPRNG 함수 목록
PHP Manual