Example: 1


	<?php

	session_start();

	$username = $_POST['username'];
	$password = $_POST['password'];

	if($username && $password)
	{

	$connect = mysql_connect("localhost","root","admin") or die("Couldn't connect!");
	mysql_select_db("phplogin") or die("Couldn't find db");

	$query= mysql_query("SELECT * From users WHERE username='$username'");
	$numrows = mysql_num_rows($query);

	if ($numrows!=0)
	{
	//code to login
	 while ($row = mysql_fetch_assoc($query))
	 	{
			$dbusername = $row['username'];
			$dbpassword = $row['password'];
		}
		if($username==$dbusername&&$password==$dbpassword)
		{
			echo "You're in!";
		}
		else
		 echo "Incorrect password!";
		
	}
	else
	die("That user does't exist!");

	
	}
	else
   	die("Please enter  username and Password!");

	?>

	

Example: 2


	<?php

	session_start();

	$username = $_POST['username'];
	$password = $_POST['password'];

	if($username && $password)
	{

	$connect = mysql_connect("localhost","root","admin") or die("Couldn't connect!");
	mysql_select_db("phplogin") or die("Couldn't find db");

	$query= mysql_query("SELECT * From users WHERE username='$username'");
	$numrows = mysql_num_rows($query);

	if ($numrows!=0)
	{
	//code to login
	 while ($row = mysql_fetch_assoc($query))
	 	{
			$dbusername = $row['username'];
			$dbpassword = $row['password'];
		}
		if($username==$dbusername&&$password==$dbpassword)
		{
			echo "You're in! <a href='member.php'>Click</a> here to enter the member page ";
			$_SESSION['username']==$dbusername;
		}
		else
		 echo "Incorrect password!";
		
	}
	else
	die("That user does't exist!");

	
	}
	else
  	 die("Please enter  username and Password!");

	?>



Example 3

	<?php

	session_start();

	$username = $_POST['username'];
	$password = $_POST['password'];

	if($username && $password)
	{

	$connect = mysql_connect("localhost","root","admin") or die("Couldn't connect!");
	mysql_select_db("phplogin") or die("Couldn't find db");

	$query= mysql_query("SELECT * From users WHERE username='$username'");
	$numrows = mysql_num_rows($query);

	if ($numrows!=0)
	{
	//code to login
	 while ($row = mysql_fetch_assoc($query))
	 	{
			$dbusername = $row['username'];
			$dbpassword = $row['password'];
		}
		if($username==$dbusername&&$password==$dbpassword)
		{
			echo "You're in! <a href='member.php'>Click</a> here to enter the member page ";
			$_SESSION['username']=$username;
		}
		else
		 echo "Incorrect password!";
		
	}
	else
	die("That user does't exist!");

	
	}
	else
  	die("Please enter  username and Password!");

	?>


Example 4


	logout.php


	<?php

	session_start();


	session_destroy();

	echo "You've been logged out. <a href='User_Login3_2.php'>Click here</a> to return.";

	?>



Example 5



member.php


	<?php

	session_start();

	if($_SESSION['username'])
	echo "Welcome, " .$_SESSION['username']."!<br><a href='logout.php'>Logout</a><br> ";
	else
	die ("You must be logged in!");

	?>


Example 6

	<html>

	<form action='login8' method='POST'>
		Username: <input type='text' name='username'><br>
		Password: <input type='password' name='password'><br>
		<input type='submit' name='Log in'>
	</form>

	</html>


Example 6

	<html>

	<form action='login9' method='POST'>
		Username: <input type='text' name='username'><br>
		Password: <input type='password' name='password'><br>
		<input type='submit' name='Log in'>
	</form>

	</html>
