RandomBytesPseudoRandomStringGenerator.php

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<?php
namespace Facebook\PseudoRandomString;
 
use Facebook\Exceptions\FacebookSDKException;
 
class RandomBytesPseudoRandomStringGenerator implements PseudoRandomStringGeneratorInterface
{
    use PseudoRandomStringGeneratorTrait;
 
    const ERROR_MESSAGE = 'Unable to generate a cryptographically secure pseudo-random string from random_bytes(). ';
 
    public function __construct()
    {
        if (!function_exists('random_bytes')) {
            throw new FacebookSDKException(
                static::ERROR_MESSAGE .
                'The function random_bytes() does not exist.'
            );
        }
    }
 
    public function getPseudoRandomString($length)
    {
        $this->validateLength($length);
 
        return $this->binToHex(random_bytes($length), $length);
    }
}