password generator

<?php
function password_generate($chars)
{
  $data = '2345679ABCDEFGHJKLMNPQRSTUVWXYZabcefghijkmnpqrtuvwxyz';
  return substr(str_shuffle($data), 0, $chars);
}
  $psw=password_generate(8);
echo $psw;
?>