CSPRNG 函数
PHP Manual

random_bytes

(PHP 7)

random_bytesGenerates cryptographically secure pseudo-random bytes

说明

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.

参数

length

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

返回值

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

错误/异常

范例

Example #1 random_bytes() example

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

以上例程的输出类似于:

string(10) "385e33f741"

参见


CSPRNG 函数
PHP Manual