PHP 8.2.4 Released!

random_bytes

(PHP 7, PHP 8)

random_bytesGet cryptographically secure random bytes

说明

random_bytes(int $length): string

Generates an arbitrary length string of cryptographic random bytes that are suitable for cryptographic use, such as when generating salts, keys or initialization vectors.

此函数使用的随机性来源如下:

注意: 虽然此函数是 PHP 7.0 添加到 PHP 中,但是从 PHP 5.2 到 PHP 5.6 都可以用 » 用户级实现

参数

length

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

返回值

A string containing the requested number of cryptographically secure random bytes.

错误/异常

更新日志

版本 说明
8.2.0 In case of a CSPRNG failure, this function will now throw a Random\RandomException. Previously a plain Exception was thrown.

范例

示例 #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

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User Contributed Notes 1 note

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5
ccbsschucko at gmail dot com
4 years ago
<?php
   
function str_rand(int $length = 64){ // 64 = 32
       
$length = ($length < 4) ? 4 : $length;
        return
bin2hex(random_bytes(($length-($length%2))/2));
    }
   
   
var_dump(str_rand());
   
// d6199909d0b5fdc22c9db625e4edf0d6da2b113b21878cde19e96f4afe69e714
?>
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