Readable random string

This code will create a readable string that resembles dictionary words, making it practical and suitable for password validation.
`<?php
/**

• @param length - length of random string (must be a multiple of 2)
  */
  function readable_random_string($length = 6) {
  $conso = array("b","c","d","f","g","h","j","k","l","m","n","p","r","s","t","v","w","x","y","z");
  $vocal = array("a","e","i","o","u");
  $password = "";
  srand ((double)microtime()*1000000);
  $max = $length/2;
  for ($i=1; $i<=$max; $i++) {
  $password.=$conso[rand(0,19)];
  $password.=$vocal[rand(0,4)];
  }

  return $password;
  }
  ?>`