<?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

        $_POST['username'] = stripslashes($_POST['username']);
        $_POST['password'] = stripslashes($_POST['password']);
        $_POST['passverif'] = stripslashes($_POST['passverif']);
        $_POST['email'] = stripslashes($_POST['email']);
        $_POST['avatar'] = stripslashes($_POST['avatar']);

    //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 = $pdo->quote($_POST['username']);
                $password = $pdo->quote($_POST['password']);
                $email = $pdo->quote($_POST['email']);
                $avatar = $pdo->quote($_POST['avatar']);
                //We check if there is no other user using the same username
                $stm = $pdo->query('SELECT id from users where username="'.$username.'"');
                $dn = $stm->rowCount();
                if($dn==0)
                {
                    //We count the number of users to give an ID to this one
                    $stm2 = $pdo->query('SELECT id from users');
                    $dn2 = $stm2->rowCount();
                    $id = $dn2+1;
                    //We save the informations to the databse
                    if($pdo->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;
?>