PHP: Generate Password

gistfile1

function generatePassword($length=9, $strength=0) {
  $vowels = 'aeuy';
  $consonants = 'bdghjmnpqrstvz';
  if ($strength >= 1) {
    $consonants .= 'BDGHJLMNPQRSTVWXZ';
  }
  if ($strength >= 2) {
    $vowels .= "AEUY";
  }
  if ($strength >= 4) {
    $consonants .= '23456789';
  }
  
  if ($strength >= 8 ) {
    $vowels .= '@#$%';
  }

  $password = '';
  $alt = time() % 2;
  for ($i = 0; $i < $length; $i++) {
    if ($alt == 1) {
      $password .= $consonants[(rand() % strlen($consonants))];
      $alt = 0;
    } else {
      $password .= $vowels[(rand() % strlen($vowels))];
      $alt = 1;
    }
  }
  return $password;
}

This is a novel idea for a password generator, but you're creating programmatically predictable passwords.