Random\Randomizer::getBytes

(PHP 8 >= 8.2.0)

Random\Randomizer::getBytes — Get random bytes

说明

public Random\Randomizer::getBytes(int $length): string

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

As the returned bytes are selected completely randomly, the resulting string is likely to contain unprintable characters or invalid UTF-8 sequences. It may be necessary to encode it before transmission or display.

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 random bytes.

错误／异常

If the value of length is less than 1, a ValueError will be thrown.
底层 Random\Randomizer::$engine 的 Random\Engine::generate() 方法抛出的任何 Throwable。

示例

示例 #1 Random\Randomizer::getBytes() example

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

echo bin2hex($r->getBytes(8)), "\n";
?>

以上示例的输出类似于：

ebdbe93cd56682c2

参见

random_bytes() - Get cryptographically secure random bytes
bin2hex() - 将二进制数据转换为十六进制表示
base64_encode() - 使用 MIME base64 对数据进行编码
Random\Randomizer::getBytesFromString() - Get random bytes from a source string

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