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<?php
$bdd = new PDO('mysql:host=localhost;dbname=users', 'root', 'passwd42');

if(isset($_POST['forminscription']))
{
    $username = htmlspecialchars($_POST['username']);
    $password = sha1($_POST['password1']);
    $password2 = sha1($_POST['password2']);
    if(!empty($_POST['username']) AND !empty($_POST['password1']) AND !empty($_POST['password2']))
    {
        $pseudolength = strlen($username);
        if($pseudolength <= 255)
        {
            $reqpseudo = $bdd->prepare("SELECT * FROM users WHERE user = ?");
            $reqpseudo->execute(array($username));
            $pseudoexist = $reqpseudo->rowCount();
            if($pseudoexist == 0)
                {
                    if($password == $password2)
                    {
                            $insertadm = $bdd->prepare("INSERT INTO users(user,password) VALUES(?,?)");
                            $insertadm->execute(array($username, $password));
                    } else {
                            $erreur = "Vos mots de passes ne correspondent pas !";
                        }
                    } else {
                $erreur = "Votre pseudo ne correspondent pas !";
            }
        } else {
            $erreur = "Votre pseudo ne doit pas dépasser 255 caractères !";
        }
    } else {
        $erreur = "Tous les champs doivent être complétés !";
    }
}
?>
<html>
    <head>
        <meta charset="utf-8">
    </head>
    <body>
        <div>
            <p class="texte1"> INSCRIPTION </p>
        </div>
        <div>
            <div>
                <br />
                <br />
                <form method="POST" action="">
                    <table>
                        <tr>
                            <td>
                                <label for="pseudo">Pseudo :</label>
                            </td>
                            <td>
                                <input type="text" placeholder="Votre pseudo" name="username" />
                            </td>
                        </tr>
                        <tr>
                            <td>
                                <label for="mdp">Mot de passe :</label>
                            </td>
                            <td>
                                <input type="password" placeholder="Votre mot de passe" name="password1" />
                            </td>
                        </tr>
                        <tr>
                            <td>
                                <label for="mdp2">Confirmation du mot de passe :</label>
                            </td>
                            <td>
                                <input type="password" placeholder="Confirmez votre mdp" name="password2" />
                            </td>
                        </tr>
                        <tr>
                            <td></td>
                            <td>
                                <br />
                                <input type="submit" name="forminscription" value="Je m'inscris" />
                            </td>
                        </tr>
                    </table>
                </form>
                <?php
                if(isset($erreur))
                {
                    echo $erreur."</>";
                }
                ?>
            </div>
        </div>
    </body>
</html>