PHP/Login Authentication/md5

Get uniqid

<?
$id = uniqid("phpuser");
echo "$id";
?>

md5 and uniqid

<?
$id = md5(uniqid(rand()));
echo "$id";
?>

Use md5 function to encrypt text

<?php
   $val = "secret";
   echo "Pre-hash string: $val <br />";
   $hash_val = md5 ($val);
   echo "Hashed outcome: $hash_val";
?>