/**
* Generate a random sequence of bytes.
* @param int $n Number of bytes.
* @param string $method Output parameter for the method used to generate
* bytes: 'php7', 'mcrypt', 'openssl', 'urandom', or 'mt_rand'.
* @return string String of bytes.
*/
public static function bytes($n, &$method = null)
{
$bytes = self::php7Bytes($n);
$method = 'php7';
if (!isset($bytes)) {
$bytes = self::mcryptBytes($n);
$method = 'mcrypt';
}
if (!isset($bytes)) {
$bytes = self::opensslBytes($n);
$method = 'openssl';
}
if (!isset($bytes)) {
$bytes = self::urandomBytes($n);
$method = 'urandom';
}
if (!isset($bytes)) {
$bytes = self::mtRandBytes($n);
$method = 'mt_rand';
}
$l = Binary::length($bytes);
if ($l < $n) {
$bytes .= self::mtRandBytes($n - $l);
}
return $bytes;
}
