Untitled

<html>
<?php>
echo "welcome to php programming";
?>
<body>
<form action="begin.php" method="post">
username:<input type="text" name="username"><br>
password:<input type="password" name="password"><br>
<input type="submit">
</form></body></html>
<?php
$host='localhost:3306';
$dname='dbname';
$can=mysql_connect($host,'root','root') or die (mySql_user());
$db=mySql_Select_db($dbname,$can) or die (mySql_error());
$id=$_post['username'];
$paid=$_post['password'];
echo $id;
if(!empty($_post['username']))
{
$query=mySql_query("select * from student") or die(mySql_error());
$row=mySql_fetch_array($query) or die (mySql_error());
if($row['name']=$id and $row['password']==$pwd)
{
echo "login successful";}
else
{
echo "login failed ";
}}