user sign in and sessions

ryanmetzler3 · August 18, 2013

I will show you my code real quick to start:

Here is the registration form and script.

<?php
include ('config.php');
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
	$username = mysql_real_escape_string($_POST['username']);
	$password = mysql_real_escape_string(md5($_POST['password']));
	$firstname = mysql_real_escape_string($_POST['firstname']);
	$lastname = mysql_real_escape_string($_POST['lastname']);
	$email = mysql_real_escape_string($_POST['email']);

if (empty($username)) {
	echo("You have to fill in an username!");
} else {
	if(empty($password)){
		echo ("You have to fill in a password!");
	} else {
		$query = mysql_query("SELECT * FROM users WHERE username = '$username'");
		$rows = mysql_num_rows($query);
	}
		if ($rows > 0) {
			die("Username taken!");
		} else {
			$user_input = mysql_query("INSERT INTO users (username, password, firstname, lastname, email) VALUES ('$username','$password','$firstname','$lastname','$email')");	
			echo("Succesfuly Registered!");
		}
	}
}

?>


<html>
	
	<head>
		<title>Register</title>
	</head>
	
	<body>
		<form action="register.php" method="post">
			First Name: <input type="text" name="firstname"><br/>
			Last Name: <input type="text" name="lastname" /><br/>
			Email: <input type="text" name="email" /><br/>
			Username: <input type="text" name="username" /><br/>
			Password: <input type="password" name="password"/><br/>
			<input type="submit" value="Register!"/>	
		</form>
	</body>
	
</html>

Here is the login form and script:

<?php
include ("config.php");
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
	$username = mysql_real_escape_string($_POST['username']);
	$password = mysql_real_escape_string(md5($_POST['password']));
	$query = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'");
	$query_rows = mysql_num_rows($query);
	
	if($query_rows > 0) {
		$user_data = mysql_fetch_array($query);
		echo ("Succesfull Login!");
		session_start();
		$_SESSION['user'] = "$user_data";
	} else {
		echo ("Username and/or password incorrect");
	}
}
 
if (isset($_SESSION['user'])) {
	echo "Welcome {$_SESSION['user']['username']}";
}

	

		
?>

<html>
	
	<head>
		<title>Login</title>
	</head>
	
	<body>
		<form action="login.php" method="post">
			Username: <input type="text" name="username" /><br/>
			Password: <input type="password" name="password"/><br/>
			<input type="submit" value="Login!"/>	
		</form>
	</body>
	
</html>

I am having two problems. When I hit login the very last if statement from the login code is supposed to echo a welcome message back out to the user with their username. But no matter the username it always just says "Welcome A". I am totally stumped on that. That is my first question.

Here is my other general question. Here is my site s-w-a-p-e-z-e-e(dot)com (take the junk out, I just don't want this showing up in search engines). When a person logs in I hope to be able to display their username above the picture in the top right of my site pages. Also when they upload a photo I want their username to be injected into the database with their photo. I am guessing you need to use sessions to do this. I am teaching myself to program so be kind haha.

Thanks so much anyone who can help!

PravinS · August 20, 2013

session_start() function should be at the top every time

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user sign in and sessions

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