how to run the login page using username and password by accesing from database

how to run the login page using username and password by accesing from database
user login system
lssson 47
md56.php
how to encrypt password
<?php
echo md5('vamsi122');	to convert to some encryption methid
$password = '123456';	we will use this md5
$pass_hash = md5($password);
echo '<br>'.$pass_hash;
?>