PHP login script

In this tutorial we are going to make a very simple login script. For this tutorial you will be needing 3 files

1. main_login.php 
2. check_login.php
3. success.php

Steps :

1. Create table called users in database login_system
2. Create 3 columns named id, username, password
3. The id field should be auto_increment 
4. Create file called main_login.php

code : main_login.php -

<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="form1" method="post" action="checklogin.php">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="3"><strong>Member Login </strong></td>
</tr>
<tr>
<td width="78">Username</td>
<td width="6">:</td>
<td width="294"><input name="myusername" type="text" id="myusername"></td>
</tr>
<tr>
<td>Password</td>
<td>:</td>
<td><input name="mypassword" type="text" id="mypassword"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><input type="submit" name="Submit" value="Login"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>

5. Create file called check_login.php

code : check_login.php -

$host="localhost"; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name="test"; // Database name
$tbl_name="members"; // Table name

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form 
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);

// If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){// Register $myusername, $mypassword and redirect to file "success.php"
session_register("myusername");
session_register("mypassword"); 
header("location:success.php");
}
else {
echo "Wrong Username or Password";
}
?&gt;

6. Then go ahead and create a file called success.php 

code : success.php -

session_start();
if(!session_is_registered(myusername)){
header("location:main_login.php");
}
?&gt;



Login Successful

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code From : http://www.phpeasystep.com