PHP: generatePassword function

gistfile1.txt

function generatePassword ($length = 10)
{
  $password = "";
  $possible = "0123456789bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ"; 
  $i = 0; 
  while ($i < $length) { 
    $char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
    if (!strstr($password, $char)) { 
      $password .= $char;
      $i++;
    }
  }
  return $password;
}