function random_string in Quiz 6.6

Same name and namespace in other branches

1. 6.5 includes/moodle_support.php \random_string()

1 call to random_string()

make_unique_id_code in includes/moodle_support.php

File

includes/moodle_support.php, line 179

Code

function random_string($length = 15) {
  $pool = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  $pool .= 'abcdefghijklmnopqrstuvwxyz';
  $pool .= '0123456789';
  $poollen = strlen($pool);
  mt_srand((double) microtime() * 1000000);
  $string = '';
  for ($i = 0; $i < $length; $i++) {
    $string .= substr($pool, mt_rand() % $poollen, 1);
  }
  return $string;
}