<?php
    if(isset($_POST['login']) && $_SERVER['REQUEST_METHOD'] === 'POST'){
        $username = addslashes(strip_tags($_POST['username']));
        $password = md5($_POST['password']);

        if(!empty($username) OR !empty($password)) {
            echo 'Toutes les carrés sont plein.';
        } else{
            echo '<div class="no"></div>';
        }
    }
?>
    <center>

    <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post"></form>
    <table width="50%" dir="ltr">
        <tr>
            <td class="head" colspan="2">login Admin</td>
        </tr>
        <tr>
            <td>UserName :</td>
            <td><input name="username" type="text" maxlength="20" /></td>
        </tr>
        <tr>
            <td>PassWord :</td>
            <td><input name="password" type="password" maxlength="20" /></td>
        </tr>
        <tr>
            <td colspan="2" class="head"><input name="login" type="submit" value="Login Now" /></td>
        </tr>

    </table>
    </form>
    </center>