PHP Random String Generator in PHP

dom string generator, generate random string, alphanumeric string, PHP function

<?php

function random_string($length = 6) {
  $conso = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
  $vowels = array("a", "e", "i", "o", "u");
  $string = "";
  srand((double)microtime() * 1000000);
  for ($i = 1; $i <= $length; $i++) {
    $string .= $conso[rand() % strlen($conso)];
  }
  return $string;
}

echo random_string(10);

?>