Código PHP:
<?php
include('config.php');
?>
<!DOCTYPE html PUBLIC>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link href="<?php echo $design; ?>/style.css" rel="stylesheet" title="Style" />
<title>Sign up</title>
</head>
<body>
<div class="header">
<a href="<?php echo $url_home; ?>"><img src="<?php echo $design; ?>/images/Bienvenidos.png" alt="Members Area" /></a>
</div>
<?php
//We check if the form has been sent
if(isset($_POST['username'], $_POST['password'], $_POST['passverif'], $_POST['email'], $_POST['avatar']) and $_POST['username']!='')
{
//We remove slashes depending on the configuration
if(get_magic_quotes_gpc())
{
$_POST['username'] = stripslashes($_POST['username']);
$_POST['password'] = stripslashes($_POST['password']);
$_POST['passverif'] = stripslashes($_POST['passverif']);
$_POST['email'] = stripslashes($_POST['email']);
}
//We check if the two passwords are identical
if($_POST['password']==$_POST['passverif'])
{
//We check if the password has 6 or more characters
if(strlen($_POST['password'])>=6)
{
//We check if the email form is valid
if(preg_match('#^(([a-z0-9!\#$%&\\\'*+/=?^_`{|}~-]+\.?)*[a-z0-9!\#$%&\\\'*+/=?^_`{|}~-]+)@(([a-z0-9-_]+\.?)*[a-z0-9-_]+)\.[a-z]{2,}$#i',$_POST['email']))
{
//We protect the variables
$username = mysql_real_escape_string($_POST['username']);
$password = mysql_real_escape_string($_POST['password']);
$email = mysql_real_escape_string($_POST['email']);
//We check if there is no other user using the same username
$dn = mysql_num_rows(mysql_query('select id from users where username="'.$username.'"'));
if($dn==0)
{
//We count the number of users to give an ID to this one
$dn2 = mysql_num_rows(mysql_query('select id from users'));
$id = $dn2+1;
//We save the informations to the databse
if(mysql_query('insert into users(id, username, password, email, avatar, signup_date) values ('.$id.', "'.$username.'", "'.$password.'", "'.$email.'", "'.$avatar.'", "'.time().'")'))
{
//We dont display the form
$form = false;
?>
<div class="message">You have successfuly been signed up. You can log in.<br />
<a href="connexion.php">Log in</a></div>
<?php
}
else
{
//Otherwise, we say that an error occured
$form = true;
$message = 'An error occurred while signing up.';
}
}
else
{
//Otherwise, we say the username is not available
$form = true;
$message = 'The username you want to use is not available, please choose another one.';
}
}
else
{
//Otherwise, we say the email is not valid
$form = true;
$message = 'The email you entered is not valid.';
}
}
else
{
//Otherwise, we say the password is too short
$form = true;
$message = 'Your password must contain at least 6 characters.';
}
}
else
{
//Otherwise, we say the passwords are not identical
$form = true;
$message = 'The passwords you entered are not identical.';
}
}
else
{
$form = true;
}
if($form)
{
//We display a message if necessary
if(isset($message))
{
echo '<div class="message">'.$message.'</div>';
}
//We display the form
?>
<div class="content">
<form action="sign_up.php" method="post">
<div class="center">
<label for="username">Usuario</label><input type="text" name="username" value="<?php if(isset($_POST['username'])){echo htmlentities($_POST['username'], ENT_QUOTES, 'UTF-8');} ?>" /><br />
<label for="password">Contraseña<span class="small">(6 characters min.)</span></label><input type="password" name="password" /><br />
<label for="passverif">Confirmacion<span class="small"></span></label><input type="password" name="passverif" /><br />
<label for="email">Email</label><input type="text" name="email" value="<?php if(isset($_POST['email'])){echo htmlentities($_POST['email'], ENT_QUOTES, 'UTF-8');} ?>" /><br />
<input id="boton" type="submit" value="Entrar" />
</div>
</form>
</div>
<?php
}
?>
</body>
</html> Código PHP:
<?php
session_start();
mysql_connect("localhost", "root", "");
mysql_select_db('database');
$mail_webmaster = '[email protected]';
$url_root = 'http://www.example.com/';
$url_home = 'index.php';
$design = 'default';
?> 
