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. */ namespace Xibo\Helper; /** * Class Random * @package Xibo\Helper */ class Random { /** * @param int $length * @param string $prefix * @return string * @throws \Exception */ public static function generateString($length = 10, $prefix = '') { if (function_exists('random_bytes')) { return substr($prefix . bin2hex(random_bytes($length)), 0, $length + strlen($prefix)); } else { $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $charactersLength = strlen($characters); $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $characters[rand(0, $charactersLength - 1)]; } return $prefix . $randomString; } } }